Question about 1996 Audi A6
How do you replace the thermostat in an Audi A6 Quattro?
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
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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Posted on Jan 02, 2017
It's the brake pedal switch. There is a switch down on the pedal arm that closes when you press the pedal down, and sends a sensing voltage to the controller, telling it the brakes are applied. This allows the transmission lock to disengage so you can shift out of Park. When that switch fails, the lock won't disengage. You need to replace that switch and you'll be fixed.
Posted on Jan 18, 2009
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 www.audiforums.com 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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