Question about 1996 Audi A6

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Car is over heating

How do you replace the thermostat in an Audi A6 Quattro?

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If you have the 2.8L 30v V6, it's a very involved process that requires the teardown of the front of the engine to change it, as it's hidden behind a feeder panel under the timing covers. I'd recommend doing the full timing belt service at the same time to avoid duplicating the labor. A dealer charges $1100-1200 for parts and labor, and an independent shop likely around $800 (at least where I live). I do it for $600 parts and labor since I do it at my house in my garage, and don't have the overhead of a shop that I have to pay for. If you're in the NE US, reply here with an email address and I can discuss it with you.

Posted on Jun 01, 2009

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It was never the thermostat, it ended up being the fitting on the overflow tank which was leaking and not allowing itself to maintain proper pressure in the system. the overflow tank was harder to find locally than to replace...cost was only 40 bucks and under ten minutes time.

Posted on Aug 18, 2009


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SOURCE: how to replace a thermostat in a 2000 audi a6

It's a BIG job involving the removal of the front of the car. If you need to change the thermostat, you may as well go ahead and do the timing service (timing belt, t-belt tensioner/relay/arm/tensioner roller, idler roller, water pump, coolant, and serpentine belt), since the front of the car comes off and the timing system must be basically removed. You can get the thermostat out without pulling the timing belt off, but you may as well do the service to avoid duplicating the labor. I changed the thermostat on my A4 two months ago (same engine you have), and the only reason I didn't do the timing system too was that I did that over the summer. Here's a couple pictures of what is involved in changing it (your A6 requires the same disassembly as my A4 - just copy and paste):

The removal necessary:

The hole in the center of the picture, behind the timing belt, where the two sections of the belt get very close, is where the thermostat sits:

I was able to change it by pulling the timing belt about halfway out off the cam sprocket on the passenger side, and then removed the two 10mm bolts that hold the coolant channeling panel over the thermostat (in the second picture, that piece is the silver metal panel that is to the left and below the hole where the thermostat sits - I put a screwdriver against it, and tapped it out of the way with a hammer).

It's a complicated job, and takes several hours if you're familiar with it. If you don't want to take this on yourself, and you're near upstate NY, reply with a comment here and let me know - I can do the job for you. If that doesn't work out, join and search out members who are local to you - one of them may be willing to work on the car with you.

Posted on Dec 11, 2009

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Audi A6 2001 quattro 2.8 mysterious over heating

Yes, replace the thermostat. Then you need to 'burp the coolant system'. Your car has all the hallmarks of air in the system, especially a heater that is cold. This is because there is no water in the heater matrix. This is why it overheats. The system must be full and with no air to circulate correctly through the radiator.

Burping involves the following steps.

Remove the lid to the reservoir, remove the radiator cap, fill the radiator to the top, turn heating on full blast, start engine and get to operating temperature, keep topping up. Squeezing the radiator hoses helps. The level will rise and then drop when the thermostat opens. Top up when bubbles stop and the level becomes constant. Put radiator cap on, top up the reservoir and put the cap on that.

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