Mercedes coolant temperature. when travelling high speeds it's mostly at 80 .
Mercedes coolant temperature This code is related to the coolant thermostat and indicates a potential problem with the engine's temperature regulation. You can stop by your dealer if you're concerned, though the eyeball look at the coolant level seems to indicate no problem. The coolant temperature sensor is located on the rear of the left cylinder head. Similar codes: P0125 Mercedes In determining the engine did not reach a “normal” temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle. the #10 tick mark after warm-up was fluctuating between the #7 and #11 tick mark at a steady speed of 70 mph and 50 f outside temp. This generic OBD-II code suggests a potential problem with the engine’s ability to regulate its coolant temperature, often due to a Sep 20, 2020 · After the service A performed by dealership, the temperature gauge jumps up to max over 120C with warning message “coolant too hot turn engine off” message. Keep an eye on your vehicle’s temperature gauge, too. Buy OEM & Genuine parts with a Lifetime Warranty, Free Shipping and Unlimited 365 Day Returns. Order yours online today and pick up from the store. Is it pretty easily accessible if I just pull off the splash shield and go from the bottom? I don't have a lot of time to work on it so before I buy Jul 24, 2019 · Nothing in front of the radiator grille and no engine changes. Dec 17, 2024 · Diagnosing engine overheating in Mercedes-Benz vehicles requires a methodical approach, as several critical indicators can manifest, such as an elevated temperature gauge, steam emission, or a coolant warning light. In this case study, we’ll walk through how a Mercedes-Benz C-Class W205 with the M274 Engine was diagnosed and repaired after repeated overheating issues. Mar 10, 2012 · Normal driving I always have the gauge between 82-87 ish. Nov 5, 2022 · W246 B180 1. Mar 7, 2009 · All times are GMT -4. Feb 17, 2024 · View attachment 2869188 So on a cold day around 30°F I let the car warm up and went for a drive. Whenever i drive on the highway past 50 miles/H, the temperature gauge stays below 80 and if i am in a traffic it start rising past 80. Appreciate any replies and comments. once because I had a low coolant warning and was worried my engine was overheating, but the coolant was just a little low and the temp was still normal. We will replace the thermostat and flush the system completely, and then pour in brand new coolant if that's deemed necessary. It monitors the engine Dec 19, 2023 · Designed as a direct replacement for your original engine coolant temperature sensor, and fits your car perfectly. Expansion Tank cap, radiator Mercedes-Benz C300 Coolant Temperature Sensor parts online. I have checked the engine coolant level, and also the windscreen washer fluid level (which someone told me could be the cause because the w/w sensor and low engine coolant sensor were wired in series). I have an UltraGauge and I keep on the screen the engine coolant temperature, and I've noticed that at times my coolant reaches temperatures higher than I would expect for a modern vehicle. 6 petrol with under 20000 miles on the clock . e. Get a free detailed estimate for a repair in your area. I even got a “engine too hot warning” and I pulled over, the temperature went back to 90 within a few minutes. Aug 20, 2025 · Check coolant level Mercedes warning? Learn what it means, how to safely inspect your coolant, and fix low level or sensor issues in minutes. When they fail it's obvious but I've seen them gradually 'go south' before outright failure. Jul 4, 2014 · The 78º is the ambient temp not the coolant temp. So, which one is sensor B10/8 (it is evidently What does it mean: This warning light indicates when your engine is too hot and there is a risk for engine overheating, as detected by your Mercedes-Benz’s computer. Apr 19, 2009 · Quick question - (98 C230) it's starting to warm up a bit (10-15c (50-60f)) and I've noticed my engine temperature gauge rising above the midway point (80c), sometimes reaching midway to the next line (approx 90c) - It does go back to 80c when I start driving & reach an open stretch. If necessary, add coolant that has been approved by Mercedes-Benz. Engine code M111 955 . 6 petrol engine with intermittent engine light coming on. Found headlight level switch broken. Maybe also replace coolant for all round peace of mind? Sent from my ONEPLUS A5010 using Tapatalk Customer: 2021 GLC 300 engine coolant temperature sensor location Mercedes The engine light is on, and the vehicle is in limp mode. Reply reply retard-is-not-a-slur • Reply reply imyourhostlanceboyle • Reply reply Desperate-Climate960 • Reply reply More repliesMore repliesMore Nov 21, 2021 · The coolant temperature sensor on Mercedes-Benz W211 models with a 6-cylinder engine is mounted in the coolant housing in the center of the engine, next to the thermostat. This provides an accurate reading of both banks of the engine. Oct 16, 2025 · A Mercedes-Benz C300 Engine Coolant Temperature Sensor Replacement costs between $273 and $354 on average. Thanks for any help again!. Is this normal??? I have been seeing the same ever since I bought it. Video shows how to diagnose, test and understand your car's coolant temperature sensors and how your car is kept cool. • I believe it’s the temperature of the coolant in the car just make sure your antifreeze levels are good and you should be good to go my radiator was leaking and I had to replace it but it still never went past 90 with the old radiator Reply reply Dry-Revenue2470 • Thermostat should keep most cars coolant at about 90deg C. Durable Construction: The engine coolant temperature sensor is made of quality material and advanced manufacturing technology for durable use, meeting or exceeding OE quality to deliver high performance and long service life. The sensor itself is located below the air pump and between the thermostat and coolant pump housing. Look around the forum you'll find people talk a lot about the heat 5 days ago · Engine coolant temperature not displayed on your Mercedes dashboard? Learn the common causes behind this issue and how to fix it step-by-step. It regulates the flow of coolant between the engine and the radiator, ensuring that the engine does not overheat or operate below its ideal temperature. If you have really small Aug 20, 2025 · The coolant temperature sensor is usually found near the thermostat housing, threaded into the engine block/cylinder head, or at the base of the radiator, depending on the model. When I look at mine, it often looks like it's running high, but that's because 'normal' temp to Mercedes isn't in the middle like every other vehicle, but like 2/3 of the way to hot. The temperature gauge is a crucial component, providing real-time feedback about your engine’s operating temperature. Jul 13, 2008 · Just take note though, the best operating temperature is at the LOWER end of "80-100C is normal operating and is within MB spec". coolant Stop, turn engine off, high tempreture to limb mode , sprinter coolant temp sensor problem , Sensor Replacement , Overheating Problem fixed by changi How to replace temperature sensor for Mercedes-Benz E-Class with the OM651 engine. First, it absorbs excess heat from the combustion Mar 25, 2024 · Unraveling the Mystery Behind P0128 in Mercedes: Latest Diagnostic Technologies When your Mercedes-Benz throws a P0128 code—signaling “Coolant Thermostat Below Thermostat Regulating Temperature”—it can leave many drivers worried and confused. Mercedes-Benz Coolant Temperature Sensor Clip - 0089889178 - Genuine Mercedes A0089889178. This Jul 1, 2021 · I have a 2019 GLA 250 4matic, 9K miles. Subscribed 32 26K views 9 years ago Locate the coolant temperature gauge on Mercedes Benz Vitomore How to remove and test the coolant temperature sensor on a Mercedes from 2002 w203 generation c200 Kompressor . Within a few minutes of engine startup, however, the oxygen (Lambda) sensor is hot enough to provide reliable data and IT becomes the most important sensor. Check Engine – This familiar warning light indicates an issue with your engine management or fuel injection systems. It is like jumping to 120 then goes down in a second. You say that you've adjusted the mixture screw. Mercedes-Benz Coolant Temperature Sensor parts online. the way the gauge is designed it looks like it's in high temp. I'll report my experiences and curious to hear about others and their coolant operating temps. Low Engine Oil Pressure Warning Illuminates when the engine oil pressure drops and is The coolant temperature sensor #0041539728 is typically located near the thermostat housing or on the engine block. The sensor is located on the left side of the block under the fuel injection lines and behind the glow plug. the sensor and/or cluster gage. Ignoring these Monitor your engine's temperature accurately with the Rebuilt Genuine Mercedes Coolant Temperature Sensor 221905560080. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 325 ohms according to this chart. Covers overheating, coolant leaks, and oil contamination. Guaranteed fitment Direct-fit OE replacement design restores proper factory cooling fan sensor function Easy plug-and-play connection Manufactured using high-quality materials to withstand intense engine compartment and cooling system heat Alloy conductors minimize electrical resistance for accurate operation Designed and tested for reliability and long life . edit: start with the easy stuffI'd just flush and fill the coolant to the proper mixture (usually 50-70% antifreeze/coolant to water mix) - use distilled water only for the mixand then see if the temp. Replacement is not that difficult but you will be working with the coolant so take proper precautions; first make sure the coolant is below 40 degrees Celsius. I first suspected the reading, i. Also i would like to know where is the coolant sensor located. Anyone know the ohms specs? Or the procedure? Is it the same as the 4 pole sensor? Thanks, ryan Nov 28, 2018 · I’m trying to test the 2 pole coolant temp sensor on the back of the engine on my ‘86 560SL. Just catching up on some maintenance at the 150K mark. The sensor itself is located below the air pump and between the thermostat and coolant pump housing Jul 30, 2009 · They said it is either the Coolant temperuture sensor or the wiring that have a problem. Mercedes Coolant Temperature Sensor - Mahle Behr 0085424517 190D, 190E, 260E, 300CE, 300D, 300E, 300SD, & more Save for later 3 Ratings Available Dec 8, 2007 · Searched the web for this for a while and nothing to show for it except where to buy the replacement parts. May 26, 2009 · The engine coolant temp sensor is THE most important sensor for determining air-fuel mixture when the engine is cold. I have the part. It does not stay at 120 for a long time, maybe like a blink then goes back quickly to 85-100. All I find is w203 DIYs. 2010 Mercedes mbz c300 coolant temperature sensor location. Oct 28, 2023 · Hi, My coolant fan starts to run as soon as I start the engine, first slow then in 20 or so seconds ramps up to full speed. getting a code for it. Apr 15, 2024 · By addressing thermostat issues and ensuring the proper functioning of the electronically controlled thermostat, you can maintain optimal coolant temperature and prevent decreased fuel efficiency in your Mercedes-Benz C-Class. Mar 25, 2008 · Your coolant temp is right on - average should be 85-90C. Mar 1, 2021 · Hi all, W212 Petrol, M274 Engine, 2013, 60k mileage Coolant temp in town is stable at just under 90 which is fine. 6K views 2 replies 2 participants last post by MAXIMUMBOB Jul 7, 2021 MAXIMUMBOB Discussion starter 5 days ago · Need to top up coolant Mercedes? Follow our quick guide to locate the reservoir, choose the right antifreeze, bleed air, and avoid overheating. Coolant performs a few vital jobs. Temperature reading on your Mercedes is not always apparent. I have a three prong brass and green plastic sensor- close to the icv Then there is a 2 prong green and brass sensor - under the air filter housing I am trying to figure out which is which. It's possible that the thermostat is past its best. Coolant isn't low. Sit back and read the provided information. 4k mi that had the check engine light come on. On the highway and higher speeds 70km/h+, the temperature gauge goes from 90 to 130 and then back down all in 2-3 mins. Engine System Warning Lights Coolant Temp Warning – Improper coolant levels and problems with your radiator may be indicated by the coolant temperature warning light. Coolant Light If the red coolant light is on, your Mercedes-Benz may have a faulty temperature gauge or the coolant level is too low. Step by step: How to diagnose low coolant level messages; fix and get rid of these error messages. Recent work done to the car: Serpentine In this article, we’ll discuss at length where your coolant temperature should be, how to fix high coolant temperature, and how the symptoms of a bad coolant temp sensor. DIY How to replace a coolant temperature sensor on a 2004 Mercedes C230Subscribe and Follow the FireHow to remove and reinstall a Mercedes coolant temperatur Nov 20, 2017 · AutoZone offers Free In-store Pickup for Mercedes Benz Coolant Temperature Sensor. The coolant temperature must be below 158 °F (70 °C). changes. Jul 2, 2021 · Coolant temp sensors resistance chart Jump to Latest 3. Can anyone point to a diagram showing Aug 29, 2024 · Hey good people I'm after some help if possible? I have a B CLASS 2012 w246 petrol I'm hoping someone can help me? So I've located ther thermostat at the back of the engine underneath the air intake manifold but was wondering if the coolant temperature sensor is built into the thermostat Mar 26, 2010 · Regarding a 1990 300SEL When I first got this car, the water temperature would usually stay at about 80 (C). Jun 28, 2023 · Find out How long can you drive with a p0128 code. Warning light is gone now. On vehicles with KEYLESS-GO, press the Start/Stop button twice. Nov 20, 2024 · The Mercedes-Benz Check Coolant Level message is a warning on the vehicle’s dashboard, indicating that the engine’s coolant level is low and needs to be refilled. I haven't noticed any unusual symptoms with my 2021 GLC 300, such as overheating or poor engine performance, aside from the limp mode. Mar 27, 2021 · Today on a 400 mile highway run, I noticed the coolant temperature gage of my 2020 gla 250 2wd that usually is steady on approx. The engine could otherwise be damaged. To troubleshoot, first disconnect the sensor’s electrical connector and test resistance with a multimeter. Temp would rise to Aug 23, 2020 · Temp should be 87/90. Illustrated step-by-step manuals and video tutorials on replacing MERCEDES-BENZ C-Class Coolant Sensor will tell you how to carry out DIY replacement of parts and maintenance of your car quickly and cheaply Order Mercedes Benz C300 Coolant Temperature Sensor online today. Engine overheating can cause significant damage to you Mercedes-Benz if not quickly remedied. Jul 1, 2021 · I have a 2019 GLA 250 4matic, 9K miles. Nov 20, 2023 · 80º-100ºC is considered "normal operating temperature". May 23, 2023 · Free and detailed step-by-step manuals with illustrations and video tutorials on how to replace MERCEDES-BENZ Coolant Sensor will tell you how to carry out part replacement and car repair yourself. Nov 11, 2025 · Learn how to diagnose and repair Mercedes cooling system problems guide with real case studies. when travelling high speeds it's mostly at 80 mercedes vito from 2016 to 2019 coolant temperature sensor location Only Motors 20 subscribers Subscribe SKU: 000-905-61-02 Positions: Rear, Front Other Names: Engine Coolant Temperature Sensor, Temp Sensor, Temp Sending Unit, Cylinder Head Temp Sensor, Air Intake Temp Sensor, Temperature Sensor Description: C300, c300 4-matic. The ECT sensor will be located in the block or coolant passage. Mar 27, 2024 · Hello, Does anyone have or know where I can get a diagram for the location of the coolant Temperature sensor for a vito 2013 w639 please. Checked the code, and the following (permanent) code was given me: "P0128: Coolant Thermostat (Coolant Temp Below Thermostat Regulating I recently got an oil change on my car, and since then the temperature gauge on my car is acting weird. Is this normal? In my other car the needle is always at the halfway point so maybe just something i'm not used to? Jul 13, 2016 · I am looking to replace the coolant temp sensor on a 2006 w209. Jul 10, 2025 · Mercedes Temperature Gauge Issues: Causes & Fixes Experiencing temperature gauge issues in your Mercedes can be both frustrating and concerning. Included with upper hose. Thanks, -Reddy. Apr 2, 2025 · If your temperature gauge suddenly stops working there is a good chance that the sensor on the engine block has failed. How to replace your Benz coolant temperature sensor responsible for ensuring your car never overheats to the point that it can cause serious damage to your engine and head gasket. Replacement is not that difficult but you will be working with the coolant so take proper precautions; first make May 20, 2014 · I've noticed in both the CLAs I've driven (the test car and my car) the coolant temperature seems to be running a little hot? The needle is a bit past the half way point. When it malfunctions, you risk overlooking serious problems like engine overheating or coolant system failures. Continue turning cap 1 counter-clockwise and remove it. I called the service dept. . I'd say runs around 60 percent. Included with center hose. Aug 20, 2013 · Hello All, As the title says. I'm guessing the original alert was a false alarm. Included with cooling pipe. These sensors (including the thermostat) help keep the engine cool, optimally p0128 coolant thermostat (coolant temperature below thermostat regulating temperature)#how to to replacemant coolant termostat Mercedes a Class/// video link Jun 20, 2021 · Hello there I have a 2014 B class SE automatic 1. Coolant Light If the red coolant light is on you may have a faulty temperature gauge or the coolant level is too low. My father told me it's where the radiator hose meets the engine in the front somewhere (literally in front of your eyes when opening the hood IIRC). Dec 19, 2017 · My 84 300D had an issue where the indicated coolant temperature stayed below 60 F. It monitors the engine coolant on the engine side of the thermostat. Check out free battery charging and engine diagnostic testing while you are in store. Inner and outer tie rods. any help with a picture would be appreciated. Unsure where the thermostat is located though. The time now is 09:57 AM. In this blog post, we will delve into the details of Mercedes Code P0128, exploring its causes, symptoms, and possible solutions. Engine Coolant Temperature Sensor for Mercedes Benz The engine coolant temperature sensor monitors the temperature of the coolant in the engine to maintain proper fuel consumption and timing for optimal performance. Compatible with a wide range of models including E350, C300, and ML350. The sensor is actually held in place by a small clip that sits in a channel created by both the thermostat on one side and coolant pump on the other. When you get P0128 Nov 20, 2024 · The Mercedes-Benz Check Coolant Level message is a warning on the vehicle’s dashboard, indicating that the engine’s coolant level is low and needs to be refilled. In normal cases, the temp needle indicates in the center. affiliate link for this part: http://amzn. Included with Dec 28, 2011 · I'd like to replace the coolant temp sensor, but before I dig in I'm curious as to what I'm getting myself in to and exactly where it's located. What Should My Car Coolant Temperature Be? Apr 2, 2025 · If your temperature gauge suddenly stops working there is a good chance that the sensor on the engine block has failed. Mechanic ran a Mar 5, 2016 · What are the symptoms of a faulty or bad coolant temperature sensor ? A week ago I posted about my fan turning on and running on high for the entire drive after it reached 90 degrees ( sounds like a jet engine) and today i noticed the dash temperature display acting funny. If you have really small The coolant temperature sensor , abbreviated as CTS, in your 2010 Mercedes GLK-Class is an important device that enables the control unit to give alerts if the engine is overheating or if the temperature within the system is rising for some reason. I noticed the temp dropped below 80°C and hovering around 75°C for the whole drive. Sep 24, 2023 · Hey all, New to W212 forum, but former R107 and W202 owner who's been here for a bit. Is this easy to replace? Where is it exactly located and will I have to remove the coolant? Oct 15, 2023 · There are two coolant temperature sensors on the W124. Then it should probably be c. Symptoms of a faulty ECT sensor include erratic temperature gauge readings, poor fuel economy, and engine overheating. Equip cars, trucks & SUVs with 2012 Mercedes Benz C300 Coolant Temperature Sensor from AutoZone. In very heavy traffic it would sometimes Apr 10, 2021 · Any ideas on the location of this sensor for the engine temp gauge in the instrument cluster ? I thought it would be near the coolant temp sensor. If the coolant temperature exceeds 248 degrees Fahrenheit, do not drive your vehicle. The temperature gauge fluctuates between 80-120 sitting in traffic quickly. 1989 560sl 5 days ago · If coolant circulation or temperature regulation is compromised, overheating can quickly follow. Watch this short video to show you how to get an accurate temperature reading on your Mercedes. Also replaced the plastic aux water pump for the interior heating, due to being siezed. I presume the emissions test was performed at operating temperature. Didn't think much of it as it was a pretty cold day but for the next few days it would do the same thing, while parked it would maintain perfect operating temp and while driving drop under 80°C, as soon as I Aug 10, 2022 · Replaced Thermostat assembly and Engine coolant Temp Sensor at the same time. The single pin sensor sends its signal to the temperature gauge in the dash while the two-pin (or in some cases four-pin) sensor sends its signal to the fuel injection management system. Apr 17, 2023 · The diagrams i'm able to see don't really indicate where this sensor is and feeling for it and using my camera aren't working as a method of locating The coolant temperature sensor on Mercedes-Benz W211 models with a 6-cylinder engine is mounted in the coolant housing in the center of the engine, next to the thermostat. Apr 12, 2025 · Mercedes Engine Thermostat: Signs of Failure & Replacement Guide The Mercedes engine thermostat is a crucial component in maintaining the optimal operating temperature of your vehicle’s engine. A little extra cooling might go a long way. When the “check coolant level” alert pops up on a Mercedes dashboard, it means that the car’s computer has detected a potential problem with the coolant system. The block and ancillaries may be fine at 100 degrees but any unnecessary heat build up will over time destroy your cables and make your plastics brittle. When you get P0128 5 days ago · Coolant light on in your Mercedes? Learn what triggers the warning low coolant, leaks and how to safely fix the issue before overheating occurs. If you notice a reduction in fuel economy, black smoke out of the exhaust, or an overheating engine, you may need to replace your engine coolant temperature sensor. Under normal operating conditions and with the specified coolant level, the coolant temperature may rise to 248 °F (120 °C). Due to the placement of the sensor under the fuel lines I recommend draining the coolant to at least a level below the opening for the sensor. This liquid mixture of water and ethylene glycol keeps your engine running at optimal temperature by circulating through passages drilled in the engine block and cylinder head. I have a 2018 GLC, but it has a digital gauge for coolant temp. That gauge is on the right side of the cluster and not viewable in the picture. If the coolant temperature exceeds 248 degrees Fahrenheit (120 degrees Celsius), DO NOT DRIVE the vehicle. Before diving into the warning light, it’s helpful to understand what coolant (also called antifreeze) does for your Mercedes-Benz. My problem is that on the beginning of a run the coolant temp gauge will fluctuate relatively quickly between 50% and say 20% while gradually increasing to the correct temperature. M113 Coolant Temp Sensor S430, S500, E430, E500, ML430, ML500 Helping Hand Auto Repair 30K subscribers Subscribed Aug 14, 2022 · Buy DAOKACUO 0009050600 0009056102 Coolant Temperature Sensor Fits for Mercedes-Benz 2006 2007 2008 2009 2010 2011 2012 2013: Coolant Temperature - Amazon. Jul 1, 2025 · The coolant temperature sensor is located on the rear of the left cylinder head. The P0128 Mercedes code is an error code which is used to define a Coolant Thermostat. Feb 3, 2022 · The coolant temperature gauge in my 2018 MB GLE 350 is indicating 1 bar shy of 3/4 line on the gauge while driving or idle, is it normal? The dealer replaced the faulty reservoir and coolant line a few months back. 2008 Mercedes S550 W221 Coolant Temperature Sensor Location S550 W221 owners often face inaccurate temperature readings and engine overheating issues. Condition: New Notes: Included with inlet hose. My engine Feb 7, 2024 · One common issue that Mercedes-Benz owners may encounter is the OBD-II trouble code P0128. If you look at an OBD sensor, coolant temp will fluctuate from 82 to 102 C while the gauge does not move. Jun 26, 2021 · Hi everyone, I had searched and read and have tried to understand so please don’t yell at me. The coolant level is fine, no leaks. is this normal, ie: do Benz run slightly above half way on gauge? Thanks. Also does this year have x2 coolant temp sensors? Thanks! Dec 19, 2017 · My 84 300D had an issue where the indicated coolant temperature stayed below 60 F. Already changed out motor and tranny mount. Reply reply The engine coolant temperature (ECT) sensor on the 2007 Mercedes GL450 is typically located near the thermostat housing on the engine block. A malfunctioning thermostat can lead to a host Mercedes Coolant Temperature Sensor - Genuine Mercedes 0009056102 C230, C250, C280, C300, C350, CL550, CL63 AMG, & more Temperature sensor in cylinder head Jul 19, 2017 · Thanks for any help. Apr 15, 2025 · In this guide, we will explore how to reset the coolant temp sensor, identify symptoms of a failing sensor across various Mercedes models, and offer insights into diagnosing these issues. Anyone know the ohms specs? Or the procedure? Is it the same as the 4 pole sensor? Thanks, ryan Engine Coolant Temperature Circuit Range/Performance What does this mean? OBD2 Code P0116 Mercedes definition: The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. Aug 30, 2018 · Coolant temp sensor location Being the nature of the repair and the current status of my certification level I cannot provide internal technical document numbers ( I hope you understand). Many thanks Mercedes W169 A150 Coolant Temperature Sensor P0128 P0118 Typical Mercedes A-Class W176 Problem ! Coolant Loss Mercedes W176 Coolant Thermostat this is how i do this job, Part: 1 Jun 10, 2020 · Hey guys, anyone know where the coolant temperature sensor is located on the gl450? I have a 2007 v8. May 12, 2025 · Mercedes coolant leak? Learn what causes it, how to spot the signs, and smart steps to fix it before it leads to engine damage or costly repairs. My engine temp gauge usually sits slightly above the half way point (9 oclock) to slightly below (10 oclock). Broken temperature sensor 1 B19/11 (upstream of turbocharger) A 000 905 64 Nov 10, 2023 · The coolant runs from the engine block (blue arrow) past the temperature sensor (red arrow) and to the thermostat (yellow arrow) and then the water pump (green arrow). More specifically, it signals that the coolant level may be too low for the system to function correctly. Free Same Day Store Pickup. Apr 17, 2024 · The P0116 error code is a common diagnostic trouble code (DTC) that signifies an issue with the Engine Coolant Temperature (ECT) sensor’s performance in your Mercedes vehicle. It has 20k on it. Included with lower hose. to/2rBaDzx (ch Oct 26, 2021 · Location of engine temperature sensor ,,,not coolant temp sensor so dont get them mixed up , one on rear sends message to ecu is ETS and one on front CTS coolant temp sensor sends the message to gauge on dash location of ECT and CTS This is a retro ride . Engine temperature gauge bouncing occasionally and diagnostic confirmed sensor fault. Video also Replacing the coolant temperature sensor is a relatively easy job if you have a lot of patience. In addition when idling, the temperature gauge in a dashobard is jumping from ca 70 to the "apparently" 100 degrees C mark. Replaced it. com FREE Mercedes-Benz E350 Coolant Temperature Sensor parts online. MERCEDES W205 Coolant Temperature Sensor Fuse Relay Location Replacement C300 C400 C450 C43 C63 C250 C200 C180 C160 C180d C200d C220d C250d C300d Buy Batter Mercedes GLS 450 Temperature/ Coolant Is this considered running hot when in idle? Had a low coolant light warning today and topped it off. A coolant temperature sensor sends the signal to the coolant temperature gauge on the instrument cluster. I prefer to connect with the mechanic via chat. Apr 13, 2010 · When this first happened (some weeks ago now) it started to display the "Coolant - visit workshop" message. Sep 3, 2008 · In A/C diagnostic I get data No 6 (coolant temperature) = 5 degrees Celsius which of course is nonsense for a warm engine. I would check the coolant temperature resistance at that temperature, since it has greater relevance. Usually it is a two wire sensor. The coolant temperature must be below 158 ºF (70 ºC). Have a 2010 E350 with 59. Check the coolant temperature display in the instrument cluster. Mercedes is the same - the gauge stays at this temp when engine temp is “normal”. The coolant temperature sensor (B11/4) on the 2008 S550 W221 is typically located near the thermostat housing on the engine block’s front or side. Jul 15, 2025 · Replacing the coolant temperature sensor is a relatively easy job if you have a lot of patience. Symptoms of a faulty sensor include erratic temperature gauge readings and poor engine performance. I have looked on-line and it says that the sensor is at the rear of the head behind the cam sensor however it's not on mine! The VIN number is WDD2042032F5855993 and the The coolant temperature gauge is in the instrument cluster on the left-hand side. Jan 31, 2011 · Hello all, I have a 2009 C300 4Matic LS. Aug 10, 2023 · How to Reset Coolant Light on Mercedes? When the warning lights on the dashboard make no sense, take a deep breath and calm down. The normal engine temperature I see is 90. And a new thermostat is a cheap and easy thing to replace. Once there it Mar 3, 2022 · The coolant temperature (black) sensor seems a bit low if the temperature actually was 64 degrees Celsius. Slowly turn cap 1 counter-clockwise to relieve overpressure. Get Yours Today! We have the best products at the right price. If/when it stops working, you may not know your vehicle's overheating until it's too late, and it should be replaced immediately with a Genuine Mercedes-Benz coolant temperature sensor to prevent any further or serious engine damage. Greg M 26 subscribers Subscribe Nov 28, 2018 · I’m trying to test the 2 pole coolant temp sensor on the back of the engine on my ‘86 560SL. kdhqfouqwfmivwxkkzqssygzdfcfsarzecrkaurqruowgtjwtnmnwqthacfiyqceryvfoiyojzugpbmildfbocve