A4 (B6 Platform) Discussion Discussion forum for the B6 Audi A4 produced from 2002-2005

My coolant temp sensor installation ordeal...

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Old Jan 18, 2008 | 10:22 PM
  #1  
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Default My coolant temp sensor installation ordeal...

I bought a new CTS to try and remedy the warm start/misfiring problem. The part is $22 and probably worth changing out at 83k as maintenance anyways.

I thought it would be a simple 30 minutes or so thing...ha! They make it so tight between the back of the engine and the firewall. You can't see the temp sensor, as it is pretty hidden and can see a little green when shining a flash light in that area.

After getting the retain clip off, I was able to pull the sensor out. The "brass" part of the sensor was pretty much a dark orange/redish color. I put the new one in and put the clip back in, which is pretty hard since there is little room for two hands to work, really only one hand at a time. I thought I had the retain clip put in properly as there are two slots in the sensor recepticle to hold the sensor in properly.

Well, time for a test drive. Drove around for about 5 minutes until I saw white smoke pouring out from under the car. I knew that I had lost some coolant when taking the sensor out so I thought it was just coolant burning off. There is a good amount of smoke so something didn't seem right. I pull into a supermarket parking lot and open the hood. White smoke is pouring out the back of the engine and smelt of coolant. I figured the sensor had popped out allowing coolant to leak.

I turned off the car and let the engine cool down a bit, which didn't take too long seeing it was only 29 degrees out. Once the smoke died down and engine cooler, I looked and sure enough, the CTS popped out. I got the clip and tried to secure it again. It took about an hour of swearing and aggrevation to get it properly in the slots and secure the CTS. I dropped the clip once too and thank god it landed at the edge of the belly pan so I could reach under the car and grab it. An hour outside in 29 degrees does not work well with the hands in tight quarters.

The coolant tank was empty so I thought great. At least the supermarket is open 24 hours so I got some distilled water and filled up the tank. Now I need to find some G12 in the morning and put it in. Also a good time to see if the stumbling is gone with the new CTS. If not, I will throw new plugs in next.

The CTS install should be pretty simple if they had given more room to work with! For people with bigger hands, it may be a problem in such a tight spot.

Btw, thanks Jimmy for getting the distilled water!
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Old Jan 19, 2008 | 05:57 AM
  #2  
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Default Ugh. Doesn't sound like fun. Were you able to get it home OK without the CTS popping....

out any more?
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Old Jan 19, 2008 | 05:59 AM
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Default yup, changed mine in 0 degree and windy day of upstate NY

Did it in my work's parking lot in a pair of insulated coveralls. I hate that fing thing!
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Old Jan 19, 2008 | 06:01 AM
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Default Yup, made it home with a tank of distilled water and no leaking!

All is good again, just need to get some G12 in a few minutes, hopefully Brookline Audi parts has some in stock.
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Old Jan 19, 2008 | 06:02 AM
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Default Yeah, stupid location for it. Don't understand why Audi didn't make it easier to access.

Especially at the angle and space, only my right hand could hold the clip in and not with an ideal grip either, kept worrying that I was goign to drop it again.
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Old Jan 19, 2008 | 07:45 AM
  #6  
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Default

My 1988 Audi 80, 1.8, had it in the same location...
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Old Jan 19, 2008 | 08:01 AM
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Default

teh suck. you can snag some G12 at a VW dealership today.
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Old Jan 19, 2008 | 08:07 AM
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Default I know. I just grabbed some at my dealer. Got

a gallon jug of it, $36 yeesh.

I couldn't really drain any of the distilled water out so just topped it off for now, at least some G12 in there now.

How much you think I should put in there? Half a jug?
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Old Jan 19, 2008 | 08:40 AM
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Default One option, trade your A4 for a Jetta GLS!!!

<center><img src="http://i132.photobucket.com/albums/q33/x1rider/jettaect1.jpg"></center><p>When I changed the ECT sensor on my girlfriend's GLS, I couldn't believe it, you can see it from 10 feet away!!!
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Old Jan 19, 2008 | 09:21 AM
  #10  
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Default That doesn't sound fun at all. I hope this solves it

Lol otherwise you may want to find an indoor garage to work on the car
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