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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old September 30th, 2004, 20:57   #1
Yz2K130
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Join Date: May 2004
Location: Baton Rouge, LA
Fuel Economy: ~34/45
Default coolant temperature sensor location

I tried searching but could not find where the sensor is located on an 01 Jetta auto? If anyone has pics, that would be even better.
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Old October 2nd, 2004, 18:39   #2
Curious Chris
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Join Date: Jun 2001
Location: Indianapolis, IN
Fuel Economy: 47/42/38
Default coolant temperature sensor location

Wow second time in one day that someone asks the same question, go figure. Here is the picture:



Item 6 is the coolant tempersture sensor that if disconnected gives you 20 seconds of glow plug on as the ECM thinks it is really cold.

Oh words next to the picture would be:

6 - Engine Coolant Temperature (ECT) Sensor -G62-
Color: blue
For engine control module
with Engine Coolant Temperature (ECT)Sensor -G2-
Before removing release pressure if necessary

Oh after my initial post my brain engage and remembered my Factory Service CD has color pictures in the wiring chart section so here it is:



Of course in your car those pipes have hose attached to them so it won't be that easy to see!!
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Old October 6th, 2004, 12:15   #3
iceman321
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Location: nowhere
TDI(s): 123
Default coolant temperature sensor location

i guess after reading the forums here and vwvortex - maybe i shoulda asked for a DIY

anyway to no avail -- i did everything *well what i thought was correctly*

found the temp coolant sensor -
moved the hose to the MAF
pulled the pin out *which was a pain in the arse*
then I was like yeah get to remove my temp coolant sensor*
*****remind you - my car had been sitting for 4 hours*****
anywho -- WHOOOSH -- yeah you guessed it coolant all over - and well - it was quickly stopped when i put the temp sensor back in --

SOOO im low on coolant -- getting some today *from the dealer* -- BY chance do i have to get this done at the dealer or did i do this this totally and utterly wrong ??? do i need to release the pressure from the coolant tank -- or clamp off the hoses or what --

also can someone explain the wire(s) that are coming off the TCS --

and help would be GREATLY appreciated -- i dont like driving with the CEL on - and more improtantly with the temp guage thingy goin on and off - its one hell of an annoying sound

SOOOO -- please respond to those who have done -- and done successfully - i was expecting no leakage and well --

anwyho
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Old October 6th, 2004, 14:25   #4
VelvetFoot
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Default coolant temperature sensor location

Well, at least you didn't do it in the dealer's lot like I did. To be fair to me, I only wanted to put in a new clip because the old one was partly broken. I didn't take into account the pressure thing. They were very cool (as opposed to my coolant) and gave me about 3/4 gal of pre-mix. And my hand hardly blistered at all after keeping ice on it for a while.

If I did it again I think I would:
1-Make sure it was stone cold (overnight at least).
2-Take cap off expansion tank just to be sure to release any pressure and put it back on again.
3-Take electrical lead off old sender and put it on new one before installing sender. If you drop it you won't lose it down there. You are trying to do this quickly.
4-I would recommend getting an extra clip. They are cheap and they break. I think the o-ring is standard, but make sure the new one has one and that you take the old one out.
5-Make sure you have coolant AND distilled water on hand. You want to add it in a 50/50 (or whatever) mix.
6-Make the switch as quick as possible to lose as little coolant as possible.
7-I'd say rinse the engine down some with a hose because the coolant is a little smelly.

Good luck on your adventure!

PS: If I recall, you just have to squeeze hard on that connector. There is a raised piece that you squeeze, I think.
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Old October 6th, 2004, 15:27   #5
iceman321
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Default coolant temperature sensor location

thanks a lot -- i actually talked to a VW mechanic

he basically said the same thing -- but he said they dont wait for it to cool down -- I was like ***???????

but anyway -- yeah the first thing he said was to relieve the pressure !!!! DAMN -- he said you may lose about a teaspoon/tablespoon - but nothing to dramatic to where you will have it GUSH out -

also its a little colder in md right now so the hood is open and i let it sit for about 4 hours and do the replacement with a flash light -- lol anywho -- hopefully this will help people in the future -- my hand has been tinglin all day too its kinda messed up

oh one more thing -- the coolant - i got more i guess i will have to mis it with distilled water somehow? any ways to do that or best way to do it?? pour it in a gallon jug or get soemthing from walmart??? i mean i wouldnt know what to do with the extra

THANKS AGAIN TDIclubers!!!
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Old October 6th, 2004, 15:38   #6
master cylinder
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Join Date: May 2002
Location: Brighton, Michigan
Fuel Economy: 51.7/47/42
Default coolant temperature sensor location

If this sensor is the cause of a MIL light, and gets replaced, will the light go out on its own or do you have to reset it with Vag-Com? MIL light came on when coming home tonight. The last time it happened, it was this but was replaced under warranty. Out of warranty now (still have 300 miles left on replacement part warranty but don't want to risk taking to the dealer to check it out as it may not be the cause then I am stuck paying their exhorbitant fee) . Don't have Vag-Com yet. How serious do you think it may be (is it OK to drive with MIL on?) Thanks
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Old October 6th, 2004, 16:53   #7
VelvetFoot
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Default coolant temperature sensor location

You could mix up some in a windshield washer bottle. That way you can see how much you put in. I'd keep the coolant. You never know when you might need it, lol.

mastercylinder, I think if the coolant sensor lights the light, it will go out by itself, even if not right away, then after a while. You don't know if this is the problem. They've already replaced it with a newer design that should be more robust. 10k miles isn't so much. Do you have other symptoms than the light? I'm thinking it's something else. There are quite a few tdi'ers in MI. Maybe check the vag-com list, put a request out, etc. Autozone used to read codes for free, but I don't know if they do that any more.
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Old October 6th, 2004, 17:19   #8
iceman321
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Default coolant temperature sensor location

ok really i cant get the plastic off the sensor -- or whatever you call it -- so basically - i have a sensor in and a sensor out -- BUT - no plastic piece to put on the sensor to get the reading!!!!!!! yeah i know im f-ed
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Old October 6th, 2004, 17:27   #9
VelvetFoot
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Default coolant temperature sensor location

What the heck are you talking about, plastic piece? Do you mean the electrical connector? You can't get it off the original sensor?
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Old October 6th, 2004, 18:17   #10
iceman321
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Default coolant temperature sensor location

well i got it off of the original sensor -- boy was that a pain in the arse

anywho -- still getting cel

and i lost more coolant -- so im takin it to the dealerrip-off-ship

peace
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Old October 6th, 2004, 18:22   #11
VelvetFoot
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Default coolant temperature sensor location

Good luck, and peace to you as well.
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Old October 6th, 2004, 18:30   #12
dqa
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Fuel Economy: 52/45/38
Default coolant temperature sensor location

More discussion here:
Coolant temp sensor disaster
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Old October 7th, 2004, 07:53   #13
iceman321
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Default coolant temperature sensor location

well 250 later the coolant temp sensor is ready and well -- im not running hot -- BUT -- now im almost at the 120k mark -- timing belt and apparently *which comes for a 95 dollar fee* 1 of my glow plugs are bad -- yeahhh -- geez anyone wanna buy a tdi ????

;-)
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Old October 7th, 2004, 14:07   #14
master cylinder
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Fuel Economy: 51.7/47/42
Default coolant temperature sensor location

No symptoms - I do remember the light going off the last time before I took it in for replacement. Not this time - staying on consistently. I can't see or feel anything wrong - runs as perfect as the day it was new. My Brother has the software in his system at work - so he says. I will try to swing by his shop tomorrow and scan for codes - I have the Bentley for DTC's. I suppose if it were anything detrimental it wouldn't be running so good ? ? ?
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Old October 7th, 2004, 15:50   #15
TDI_Michael
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Location: Louisiana
Default coolant temperature sensor location

Is this sensor (number 6 on the above diagram) the one that also goes to the temperature gauge inside the car, to the OBD computer or both? I just started having intermittent problems with my gauge indicator, sometimes it reads 190 other times it stays downscale when the vehicle is at normal temp. I checked the wires to this sensor today making sure they were secure and the clip was in place but the problem persists. I also tried to verify whether I had a blue or green temp. sensor but unless I am just not seeing it it appears you have to remove the wiring clip to be sure.
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