I've got a '00 A6 2.7tq 6sp that is having trouble maintaining temperature. It seems to warm up to temp properly, but once the stat opens it hunts for a temp between 1/3 and 1/2 on the temp gauge. After the engine is heat soaked, it seems to stay at the 1/2 (12 oclock) position without problems. Seems like a lazy thermostat to me. What do you guys think?



Just got off the phone with the dealer - they said $400+


Whats involved in this replacement? I have replaced thermostats and done alot of my own maintnence in the past, but am a bit intimidated by my the Audi. The service dept said they "have to remove the top part of the engine" - It cant be that difficult can it?

Does anyone have a link to a procedure online for thermostat replacement?

Thank you for any help in advance!

 

To change the thermostat, you have to go almost through the entire timing belt change procedure, which includes moving the lock carrier to the service position. How many miles are on your car? If it's time for a timing belt change, this isn't such a bad thing. The thermostat is routinely changed as part of the timing belt service, along with the water pump, etc. I would definitelytry to locate a good independent technician for that job, instead of a dealer. If you're inclined to DIY, you can save a bunch.

Another thing to consider is the temp sensor. These are notoriously bad parts and are cheap (<$10)and easy to replace. I might try this first.

Here's an excellent write-up from the AudiWord tech articles section.


http://www.audiworld.com/tech/eng63.shtml

 

Fantastic advice - thank you! I actually just bought the car, and knew the condition existed when I bought it but had quite a bit of negotiating leverage as a result. It has 68k miles, so I think I'll hold off on the timing belt for another 15-20k. I like the idea of replacing the remp sensor. Is there also a writeup as to how that is accomplished?

You dont perhaps know anywhere local to Salt Lake that specializes in Audis do you?

Thanks again!

 

I think there is one on this website.

I know there is one at AudiWorld, see the links:

http://forums.audiworld.com/slc/msgs/1011.phtml

http://forums.audiworld.com/slc/

Regarding waiting 20K miles for the timing belt change, that may be a bit long. I think I'd do it by 75K.

Here's another link that will provide you with hours of reading pleasure:

http://sonolithics.com/files/a6_links.html

Excellent choice of car!

 

Check this link and thread:

http://forums.audiworld.com/a6/msgs/646228.phtml

Once you find the sensor, it should be pretty easy to remove. Open the coolant reservoir cap first to relieve pressure. You'll need to remove the MAF hose to get access, then remove the connector, pry out the black plastic retainer clip (it'll probably break), and then pull out the sensor and o-ring. A little coolant will leak out, but not much.