How VW Coolant Temperature Sensors Fail

For full show notes visit the blog at;
Hey everybody, today we are back with another round of failed VW parts! This time we are breaking down the engine coolant temperature sensor, or ECT. You may also see this part referred to as a C.T.S. (coolant temperature sensor)..
Sponsor Of The Day
Today’s show is sponsored by Deutsche Auto Parts. Also check out their new site at SHOPDAP.com
Join me today as we break down:
What is a VW ECT
How does a VW ECT work?
How does a VW ECT fail?
The symptoms of a failing ECT
Diagnosing a bad VW ECT
Is a VW ECT a DIY part?
and more
Humble Mechanic Podcasts
• The Humble Mechanic Po...
Failed VW parts videos
• How VW Parts Fail
Tool Reviews
• Tool and Product Reviews
How To videos
• How To Fix Your Car
MK1 VR6 Swap Videos
• VR6 Engine Swap MK1 Ca...
Follow me on:
The Blog
humblemechanic.com
INSTAGRAM
/ humblemechanic
FACEBOOK
/ humblemechanic
TWITTER
/ humblemechanic
GOOD STUFF ON AMAZON
goo.gl/5304Qw (affiliate)

[@grumerguy]

Here's something I can only refer to as a cascade failure. Purchased a new beetle cheap. Changed the heater control because the heater wasn't blowing, timing belt, water pump, and tensioner because I wasn't sure when it had been done last or ever done, since the odometer reads 130,000. Before I changed these, I noticed no heat from heater. Replaced the thermostat. It was stuck open. After that I found radiator fans weren't working. After testing found the thermo switch wasn't working. After all of that, suddenly got a code for the ect. Replaced that, now I have heat. I only paid 800 for the beetle, and I plan on driving the heck out of this car. I call it my beater bug. It runs really great! It's so fun to drive, and it's bigger on the inside! I guess that's why it was only 800 bucks! I've done much more to this car, but the cooling system had been badly neglected. Not really that expensive to fix. Oh. And one more thing. I tried to replace the reservoir on it but the after market bottle that I got from autozone had a problem. The pins in the sensor were too short and the connector wouldn't make contact so it kept giving a red flashing light on the dash. I ended up putting the old one back on and took that after market piece of junk back to autozone. That's my story. 5 speed standard. I love this bug!

[@hayerubihayerubi5720]

Can I join your nightmare , It was recommended for me to change thermostat and W/p + belt , until local mechanic put things right for me. I spent £180 for previous work , the offending part was £5.95😂

[@sletourneau3]

Volkswagens, everyone calls them trash yet you replace 4 parts, all very diy, and they run for another 20 years 🤷‍♀️🤣🤣 my golf is 20, I bought her super cheap, she wasn't loved at all, so now I'm replacing her sad parts and turning her into the car she can be. Though the entire thing, she's run. I'll never own another car. Vdub for life.

[@powdere4donuts]

What year is your beetle?

[@grumerguy]

@@powdere4donuts It was a 2000. I sold it to downsize.

[@AltruisticWarrior]

I basically have the Jetta that is your beetle. 5 speed w/ the 2.0 CBPA. Dude, you take care of it, fantastic and reliable setup that's relatively cheap to maintain. Only thing I insist on, have the dealer do your oil changes and flush the coolant every 2 or 3 years. Also heads up, don't be surprised if you find oil in your coolant soon. The oil coolers fail pretty often, on my third in 200k miles. Keeping really good coolant and checking your fluids at least once a week will save you from bigger problems down the line with this issue as you can get coolant in your engine when this cooler fails, vent your reservoir after running the engine anytime you turn your car off to keep it from pushing into the oil. Otherwise under pressure it'll push the other way since oil is under a much higher PSI. I had thus issue for months and surprising I never had an issue. The dealer is happy to preemptively tell you about certain maintenance though so it's worth the expensive oil change. Always Castrol 5~40 Edge Syn too!

[@WorknB]

Always helpful . Years after this post . I’m a B5 guy and still have the 99 passat i took the kids to kindergarten in . Son has just helped me swap it to manual . . Never replaced the temp sensor and it’s black . Go figure . You covered all the likeliest potential issues Humble guy . Thks again

[@lolearllol]

Hi mate I have a b5 Audi A4 (same chassis) with a 2.8 V6 I have a hot engine stall and not start issue I will be changing the temp sensor soon hoping it will fix. Did you have the same problem?

[@chrisragone8785]

My 2004 VW Golf started taking multiple tries to get it to start when the engine was cold from sitting a few hours. I replaced the Coolant Temperature sensor and it cured the problem immediately.

[@noobgames1900]

Did you have a code?

[@susanmc6902]

Dude! I don't know what to do without you? You have been my go-to guy since buying my 99 Jetta MK4. You are very informative and I especially appreciate your dissecting parts for better understanding. Wish you lived closer LOL You'd be my new bestie ❤😉 Please don't go anywhere!

[@lewisc581]

Hey Charles... love your clips very informative, and doesn't treat us like dummies. Having issues with a New Beetle - just fitted new MAF - made no difference, but your explanation of the temp sensor makes loads of sense ( Really bad cold start, huge dead spot once running) . It's a green one, but cheap enough to replace. And easier than the next step which has to be the fuel filter & pump.

[@cadizwilmo9687]

Thanks for this video HM! I had the starting problem with my 2000 Eurovan VR6. Replacing the GREEN Coolant Temp Sensor fixed my starting problem. I didn't know there's 4 Coolant Temp Sensors in my engine. Crazy!

[@HumbleMechanic]

The Eurovan is a whole different beast!

[@cadizwilmo9687]

@@HumbleMechanic Your video helped convinced me it was the green CTS. Had to share your video to my mechanic to also convince him. Haha. Now he's a HM fan too!

[@GarthGoldberg]

When you buy a VW they should include an extra coolant sensor in the glove box because you're going to replace it eventually.

[@HumbleMechanic]

Garth Goldberg LOL I have replaced enough of them to kind of agree. But I think price wise, they are about $40

[@MrGoogelaar]

When you buy a VW they should give you a box with extra parts for the whole damn car as there are no parts that will not need replacing soon, it seems as if they go out of their way to make things as unreliable as possible.

[@MrAlphacallsign]

Philip Koen. I have a Volkswagen Jetta 2011 with 110,000 miles and never have this sensor bad , is a very reliable car so far

[@misschoichoi]

Garth Goldberg j

[@glahut93]

The only difference between a Volkswagen and a bucket of shit is the bucket..

[@garretsloan5990]

Excellent video! $15 part when salesperson wanted me to replace the starter!!

[@tazgamerplays]

Dealership wants over $700 to replace it and the plugs.

[@Icutrauma11]

I don't like the phrase fail. As if they are to last forever. These are parts that wear out due to use. His information is educational and very instructive.

[@estherbaca]

Thank you so much replacing it today so glad my son recommended you 👍

[@MichaelPatton619]

I have an '06 2.5 beetle. About 5 seconds after starting, the coolant light turns from blue to red. I turn it off an restart, which currently does the trick. I went ahead and ordered the CTS.. thanks for the video.

[@HumbleMechanic]

+Michael P that sounds like maybe coolant bottle issue

[@outboardfixer]

Just had one done at VW dealership on 2014 Tiguan....360.00 and I had the new one with me. LOVE my VW.

[@adrianrainbow1995]

Dude, thank you, lucid and nooooooo waffleing!

[@kentanderson8575]

You have the best videos!

[@adamlandry4591]

Thank you this video helped a lot and was more than informative. We need more in depth people like yourself

[@HumbleMechanic]

+Adam Landry glad to be able to help! :)

[@HumbleMechanic]

+Adam Landry glad to be able to help! :)

[@nathanharrison423]

thats exactly whats going on with my 2001 audi allroad! thanks

[@cameronyoung2004]

2003 passat. Thank you for your knowledge.

[@lincolnbothang7258]

I recently replaced mine on my 1.8t Polo GTi and I immediately noticed good fuel consumption so if you have this fault I recommend replacing it asap.

[@peanutbutterisfu]

The cts in my alh was actually reading about 15% higher then actual temp. It’s cold out so when warmed up the gauge was right in the middle seemed normal but when I go to start it in the morning the glow plugs wouldn’t turn on for more then a second because it thinks it’s warmer outside.

[@dggrossman7217]

Good talk. I'm always looking for information on how long parts usually last, under what conditions parts fail or wear out sooner, how to check a part for failure, etc. Thanks for the failure info on temperature sensors.

[@balazsnagy7170]

Thanks a lot, professional and informative.

[@abrahamgsolis]

Dude, Thanks alot. Ive been having an issue with both of my fans staying on for over 10 min after the car has been off. i recently got a CEL took it to Autozone and the told me with was ECT. After watching your video ill be changing it for sure. thanks!

[@scrwbl8]

Failed on my B6 at the time. Had the meter fall down and pop-up again. Was gone after replacing. Now looking at replacing the one on my A5 B8 as it's not running all that well when cold and running under 2K rpm.

[@putumohi538]

Very inyeresting video

[@leopoldocotamouet352]

thanks for the tip i have just ordered the sensor i have a bad coolant flange and working also on the lower arm suspention on a 2002 new beetle thanks to your video of lower arm with polyurethan i will réplicas both of them

[@waw225]

I've had a no start issue with my 2002 vw jetta tdi (manual transmission) for the last couple of years. After sitting with a charger on the disconnected battery for variable periods of time the car would start and run fine. It was a crap shoot whether or not it would start a second time. The instrument cluster warning lights would flicker and sometimes there would be clicking of the relays under the dash. Recently, the temperature warning light started intermittently flashing on and off and the same symptoms as described would occur and the car would not start again. Today, I replaced the temperature sensor and after replacing the coolant that I lost in the process I started the car and let it run for a couple of minutes. It started and ran fine as usual. I was able to stop and start the car multiple times without the warning light symptoms, clicking of relays, etc. I'll see if the the coolant temperature sensor was the problem in the next couple of weeks. The sensor is the green, four wire type. Thanks for the intelligent videos!

[@mohammadjbour2067]

Please excuse the long post. first of all, Many thanks for the Video, it really helped me resolve an issue similar to what you described, but i would love to get your comments on the subject, i have an Audi A6 C6 2.0TFSI 2008, a few months back, i noticed that the coolant gauge cluster was not working. and since i still maintain my car in the dealer, i took it for inspection, once they had a look at it, they found a code (forgot which one) and they cleared it, the gauge started working again. On the same day, the gauge failed again, so they had another look. after a full day inspection, they replied that the issue was in the ECU module. their assumption was based on the fact that gauges are working fine (they tested them), the ECTS was working fine, since even though the dashboard gauge was not working, the ECU was still able to read the temperature and start the fan accordingly when it get hot, and that all wiring within the car was not short circuit. it was not a good news for me. so i did a few research, and i watched your video, and next day i came back and i asked them to change both ECTS (my car has the 2 wire model -black), and to change the thermostat also (since it was partially stuck open). so far 3 months passed, and its still working. what do you think? i have asked other audi service shops, and they replied that similar cases were noticed to other customers, but with different resolutions types. one of the service shops told me, that one customer changed his ECU module, but the problem came back and he just gave up. i know the saying (if its not broken, don't try to fix it), i just want to understand, in the 2 wire ECTS module, how is it possible that the ECU was able to read the temperature changes, while the gauge cluster was not, if its the 4 wire system, its logical, as there are 2 signals through 2 separate channels were one of them could fail, but on the 2 wire system, how its usually working?

[@rpady2602]

Charles, you are true PROFESSIONAL!!!! Thanks for sharing your knowledge! Quick question, on my 2012 VW CC, it runs rough at cold idle with random misfires. At 39 degrees Fahrenheit it reads 3,930 ohms. Once it warms up all smooths out. Temp gauge operates normal. I'm thinking temp sensor?? What do you think?

[@cs_044]

My parent's 1.4 Polo SE from 2010 has had this issue for a few years now, so this seems to be the part at fault, and unfortunately we are suffering the issue where the vehicle just will not start at all when it gets very hot, as the car isn't used to high ambient temperature here in the UK, when it reaches above 30c outside the engine will be tempromental causing it to fail to start, so I will look more into this but I believe that is what it is.

[@markchandler001]

Do you have a video on how to change one?

[@jeffame7]

.

[@Kuyper87]

Thank you very much!!! Going to replace it tomorrow!

[@dustinclark89]

Hey charles, great video! I've been getting what I think is vapor lock, and a check engine light for the coolant temp sensor. hopefully that will correct it. thanks for the video !!

[@dustinclark89]

aaaaand, I dropped the clip into the engine compartment and I cant find it

[@slocavky]

On my mk4 TDI golf. I have the 4 pin. The two pins that went to the cluster worked fine, guage was perfect. Two pins went to the ecm and it cause a no start in the winter due to the glow plugs not working. Took for ever to figure out. Forums said to unplug it as see if the glow plugs lights stayed on for 30 seconds and it did. That means bad sensor. Replaced it with a green one and it was perfect.

[@toddculbreath9580]

Hi Charles, where is the repair shop located??

[@christopherjchimelak7025]

2001 beetle 1.9 coolant migrated in the wires causing a no start. Waiting on the new harness now. Hope it works!

[@kakajo99]

Hello Charles my gauge shows 190F but my OBD live data shows 230F. Can you suggest what might be the problem?

[@bryancosio9351]

Would a bad ect sensor also prevent my cooling fan to function at all on my b5.5 passat 1.8t? Love your channel btw. thank you

[@Mr_Everyman]

@humblemechanic was really sad when you didn't cover the major issues that a faulty ECT can cause a TDI...... Glow plugs won't engage if it's bad, even if it doesn't show a code. You can unplug it and your glow plugs will work again to start a TDI car when it's cold. A bad ECT will also cause a TDI to run so rich that out won't start or run without smoking and choking you out. It would be nice to see you make a separate video labeled "TDI ECT problems" or something similar covering all the possible and common issues. Thanks a bunch either way, great video for gassers for sure!

[@smokeybear390]

I bought an 2003 vw gti with a check engine light, it was hard starting, and stopped starting, i got a cel for a short in the ect, it was a light green sensor that failed , they're cheap and easy to replace though

[@boomerguy9935]

Green vs black. Now there is grey. Hmmm..... How about a video on finding it and the correct procedure in changing it? Still, great info!

[@maximusaurelius7306]

Very informative, thanks man!

[@D0zer122]

My wife has a Mk4 (Type 1J) MY2000 and it is the 1.6 Comfortline. We are having problems with the car making a backfiring noise (noise is local to the engine bay...'buck' noise). I have just replaced the coilpack as I've seen sparks jump from it to an adjacent spark lead. Spark leads and spark plugs are replaced after a dead No. 3 cylinder lead was discovered. With the coilpack now replaced i.e. changed out VW# 032 905 106B with 032 905 106F (newer revision) and still have slight RPM instability at idle and when accelerating I still feel a type of drag as if the car isn't making the demanded power at that instant. Having scanned the vehicle, all errors i get are the following (Note: this is a replacement lambda sensor after old was replaced): 4 Faults Found: 00525 - Oxygen (Lambda) Sensor (G39) 05-10 - Input Open - Intermittent 00525 - Oxygen (Lambda) Sensor (G39) 07-10 - Signal too Low - Intermittent 00537 - Lambda (Oxygen Sensor) Regulation 19-00 - Lower Limit 00525 - Oxygen (Lambda) Sensor (G39) 27-00 - Implausible Signal Furthermore, the engine consumes oil, but not a whiff of smoke out the exhaust or drips. Just some on the perimeter of the intake manifold and not much trace of leaks. Any suggestions as I'm going mad after spending ZAR 3800 ($321 equivalent) on the coilpack. Looking forward to replies

[@d.d4184]

Nice explanation.

[@garethgc1141]

Can this cause an engine overheating?, currently have a similar situation but far from home to fix it?

[@dj_marty_d]

Great video!! Very informative! Thanks a ton.

[@jeremyfarlin9374]

Geeze i hope you see this. My CTS in my 01 jetta VR6 is vibrating and feels like a little motor running after the car is off. The temp reading is fine but im going to replace it anyway. Just really weird like the connectors are frying the coolant inside.

[@DisgruntledDieselMechanic]

hey Humble mechanic I have a 2013 Jetta 2.0L. I have a ECT code P0118 (G62) sensor. On top of that its keeping both my AC and rad fan on at all times full speed.

[@MrGuz45]

2007 Jetta code p2181 and its not overheating, however I noticed that only one fan works with the AC turned on. Replace the ect first, then the fan? Be the smaller fan.

[@kamtherobloxgamerlongden1766]

Here’s a question! I started my car this morning after sitting for days and it had a hard time trying to start but when it did the temp was already at 190 and went to 220 and stayed there as driving

[@ajc5869]

Mine actually failed and reported a higher temp reading than normal, scared the crap out of me.

[@LarryMorrow2]

If you have time, I'd love to know why there's 2 sensors right next to each other on the water distribution flange of the 2001 Cabrio I'm working on. A green 4 pin, and a white 2 pin.

[@rafaelcukaj8742]

Very helpful thnx

[@V10PDTDI]

I have replaced ton's on those sensors the cars that are not fun to replace is the v6 or 4 cylinder Passat or Audi the ALH TDI are some time stuck in the Aluminum housings (manual gear box only) the easiest are the 2 litre 8 valve engine the sensor is upright and you loose almost no coolant have you notice when a car that has the original temp.sensor on the black ones there is always a yellow paint dot on it .

[@tonyhairston6725]

Great video! It was very helpful. It was also very well spoken and very well thought out. Good job !

[@dougtaylor28]

thank you

[@BashOnHobbies]

Hey man! I just found your videos and they rock. I have a MK4 question if you don’t mind giving me a hand. As soon as I turn my ignition key on my fans start. Doesn’t matter where the knob is(I.e. feet, face, defrost, ect). I’ve unplugged multiple points such as the coolant temp sensor(working btw) the high pressure ac sensor, ac compressor, and they will only shut off when I unplug the FCM. So I ordered one of those but just wanted to run past you!

[@matthewgarland5944]

obd2 scanners got me at 200 or over before fan comes on ive replaced the air conditioning switch and the radiator temp switch im onto the cooling inlet ets ... my runs have been straight hiway and the fan seldom comes on if after i park in the drive and continue to idle the fan will come on slow i changed the fan for funny noises wasnt the best viscosity but i still i get the common read of 200 degs or more before fans ... im questioning heat prostration during trips like terrible in lower gears after long drive

[@sloth1996]

Hey humble man. On a 2015 gti, could a bad coolant temp sensor cause the car to stall at idle? It's increasing fuel pressure high AF before it stalls.

[@kabwamajoseph1975]

hi Charles, thanks for that support. But kindly help me on this as well, have a Passat 2006 with a BZB engine but having a Random misfire in all the cylinders yet the coils, spark plugs and injectors are all new. It goes on and gives off dirty exhaust. Would you think that the problem could be with the coolant sensor or something else because we measured the compression for all the cylinders and they were fine.

[@therealpofo]

I have a 2009 Tiguan with a P0118 code high output for sensor 1. There are two sensors and they are both new as I just replaced the water pump and while I was in there I just put in two new sensors. But I can not figure out what sensor is #1 and what is #2. I want to assume sensor #1 is at the water pump but want to confirm before digging into it deeper. BTW this code existed before I replaced the water pump.

[@NiroRaythIIDaz]

I’ve just had this issue. Changed the sensor in five minutes but I still have an intermittently working temperature gauge and I’m totally stuck now

[@alkevinzmedia]

Super useful! Thank you! :)

[@royguerrero5358]

you were very helpful, thank you very much.

[@HumbleMechanic]

+Roy Guerrero awesome glad to help

[@GenerationRx]

Pretty sure this is the cause of ALL my MK7 GTI's hiccups, gonna change that terd tomorrow.

[@Janet_Airlines802]

What about running cold? Not warming up driving. It’s throwing the code for it. It’s 21 degrees out now

[@caspiansafety6099]

Hi, my passat 1998 water temperature is not rising to 190 f just stand between 4-5th lines at the Gauge

[@cme3172]

Question, would a bad cooling control sensor even when it drops to zero will it cause the cooling fans to turn on??

[@JRJUNIOR215]

good video i replaced the sensor and wiring and it works but i still code?

[@inexcelsisdeo8475]

I like how he loved this but didnt fucking answer?

[@blackericdenice]

My 2004 Golf 2.0 GLS coolant temp sensor has 3 wires. Has he not heard of this?

[@HumbleMechanic]

Not for the coolant temp sensor. That’s odd

[@blackericdenice]

@@HumbleMechanic My Golf will not turn faster than 3100 rpm. I'm getting po343, 351,352,353 and 354. I change the cam sensor and nothing has helped.

[@4polelowpass]

My mark 4 (1999) Golf indicates a coolant temp at around 60 degrees while cruising in cold weather (about 10 degrees ambient or lower). Noticed this after I replaced the radiator after a minor crash. The new radiator has a higher fin density. Could it be that the new radiator is too efficient?

[@bmos02]

Joachim Hillestad only if your thermostat is stuck open or partially open.

[@jasonga]

My bjb 1.9 has 2 sensors, one on bottom of rad and the other on side of block above gear box!?

[@SILVAA951]

I hope this is my problem ... my car does not over heat starts up fine but once my engine is warm it won’t start up again once I turn it off .... car stays on and won’t stall .... 2013 Jetta

[@angelonicassio7131]

Could this cause no heat inside the car? I have checked all the heater components and no luck?

[@pr0xZen]

Best tip I can give anyone in need of replacing their VAG CTS; Always buy the genuine VAG part. Even they have serious issues manufacturing these, with great losses in quality control. With cheap 3rd party replacement, to cut cost, quality control always suffer first. Then inferior materials and processes. I'm all for 3rd party parts, but never with VW, Audi, Skoda etc, coolant temp sensors. After changing the same 3rd party afyermarket CTS over a years time, it will start to make sense ^^

[@MrGoogelaar]

pr0xZen Almost hard to believe there are worse parts than original VW parts.

[@PURGE-3000]

My fans don’t turn on when temp rises but as soon as I turn off. The fans go on. Can the sensor cause that ?

[@mikeclaytor1739]

Get a random and intermittent po2181 temp is 190 and does not wavier!

[@ix-Xafra]

I buy half a dozen at a time for my T4

[@mynameismud76]

Love the channel, will you be doing a MAF fail vid? cheers

[@tebogondlovu2800]

Can it be the reason for my car taking long to start when parked for long or over night?

[@niacal4nia]

My 1999 VW Passat V6 had a blue ECT that failed and showing a lower temp.

[@michaelrogers6198]

2011 Golf 2.5 Charles, I'm so glad I found your videos! Thanks! Now my question: Is this sensor also where it gets the reading for oil temp in the MFA readout? My dash gauge goes to 190 fairly quick and pretty much stays, but the oil temp reading is all over the place, and sometimes will drop 20 Deg. F just turning the car off and then on. It has a no-start issue sometimes when I drive a while, then turn it off for a few minutes. Usually, the oil temp reading goes from something like 175 to 190 or so, to '---' (less than 122F/50C) and won't start. I think it might be dumping gas in and flooding, since it thinks the engine is cold. I think this car has a two terminal sensor, so only one thermistor.

[@roamwashington2230]

Love this dude

[@HumbleMechanic]

Thanks man

[@robertalexander117]

Where is the sensor located on a 2013 Volkswagen Teague one?

[@edwardgreen8788]

On the four prong water temperature sensor does one of the prongs operate the idiot light on the dash panel

[@hormisdasrogersmubiru1052]

What causes high water pressure when ac is switched on yet the cylinder head gasket is just changed

[@themattrixrevolution]

not sure if my is inaccurate, but I put water and when the water start boiling and it's stays at 90c then suddenly jump when I see steam come out of my car after a while. then yet again it could be elevation. 1,500 feet. then yet I haven't replaced it in a Long time

[@raafatkamel28]

thank you very helpful

[@HumbleMechanic]

Raafat Kamel You are welcome

[@raafatkamel28]

if at advance auto parts they cannot figure what is that piece is and ask me to go to the dealer, after i watch your video i knew what it is and ordered it online from advance without the help of the sales man and pick it up next day thank again for this video.

[@bvflorin]

my radiator fan is not stoping after switch off the engine and take away the key (even after 20 minutes). is possible to be the ect malfuntion?

[@bobysolo8367]

Hey Charles, very detailed video btw..Can you come up with answer about my 01 ALH engine ECT (as my mechanic calls it), strange behaviour? Just installed a new tested ECT, however I'm faced with same phenomenon as with the previous existing ECT: While I turn the ignition on (at - 15 C weather condition), there's no power going to the Glow Plugs! When I disconnect the ECT plug, np, power goes to the glow plugs as it should, then cuts off after three min while engine running (on any case, no power whatsoever comes to the three Coolant Heater Glow Plugs)! I did also got the same phenomenon after putting another ECU in the car! My mechanic now is talking about all kinds costly possibilities and I'm thinking to simply put a power cut off switch behind ECT plug, to use it just to start the car (which isn't what I like to do anyway). Thank you in advance..

[@otm77]

Thank you!

[@alanharris8282]

My mother-in-law has a 2001 EuroVan. No major problems with it so far. The water temperature gauge does not move. The fans come on as soon as you turn on the car. The heater never starts blowing hot air it only warms up a couple of degrees but the fans continue to run and the motor does not overheat. Could a coolant temperature sensor cause this or is it a bad thermostat? Would really appreciate some help with this. Trying to do something for a mother-in-law!!! Merry Christmas

[@stigar905]

I have 2013 Passat 2.5l changed the over flow bottle and flushed the coolant. Now light comes on says add coolant but bottle level is fine and temp stays at 190 degrees. Any help appreciated.

[@afvittoria]

Help!! Where is the ECT located in 2012 Jetta GLI? Thanks.

[@danthetoolman4311]

I installed the sensor but coolant shot out of it !!!!! Would you Know why?

[@voithRetarded]

I would not believe how much trouble this sensor could cause, i didn't pay attention to it as it is small and cheap.. My symptom was a pretty hard start up with a rich mixture, especially on a warm engine after a 5 min drive. I started replacing tps, cps, idle air control valve, map sensor and still no luck. Fuel pressure was ok. One day i decided to unplug the coolant temp sensor and improvise a warm engine start by connecting a 400 ohm resistor and voila.. the engine started right up and running happily. I replaced the part and the problem is gone.

[@HumbleMechanic]

It’s crazy!!!

[@rossim1918]

Can there be no code and be bad? Sometimes the 1.9L beetle 03 will not start, acts like a fuel pump problem with around 140,000 miles. Please help, thanks

[@fernandotorres2864]

I have a problem, my car can´t not start in coold weather, i change the coolant sensor thinking that was the reason, but the problem persist, the car start, at the third time i turn on the key, its a 2001 jetta.

[@Tekka579]

Why does my heater always run even when I dont have the AC on?

[@atroche1978]

I have the check engine light on. I took it to Autozone to have it scanned and they pulled codes p2181 and p0421. I was told its the CTS. I changed the original one maybe 100,000 miles ago due to the needle fluctuating. This time the needle stays at 190 so I am wondering if it would fail so soon. The readout said plausible signal. Thanks.

[@deyanstoykovic9231]

MY VW Amarok has had a cooling system issue recently where it seemed the water temp was colder than it should be. While driving the car, the temp would be around 84 deg, but drop down to 50deg C. Then sometimes go up to 93-96, but quickly back down. I have had the thermostat changed, and while running the first time, the temp steadily went up to 94deg C and was up and down around that temp, but when idling my car for a while, the temp gauge drops down to 45deg C, and while idling, it stays around this low temp. Is that normal for the temp to be that low at idle?

[@REPOMAN24722]

Mine is hopping all over the place intermittent 2.0 TDI 2008 PD non DPF every few seconds, is it an easy replace, already threw a code.