Question about 1997 Audi A4
Overheats, where is the thermostate located, top rad hose hot, bottom hose cold.
Too late to help original poster no doubt, but might help others:
2.6 V6 is same block and general layout as 2.8 12V engines in early-mid 90's Audis (and to a certain extent the 30V's too).
Your symptoms suggest three potential problems.
First is a blocked radiator (unlikely to get completely blocked, but worth a pressure flush to find out).
Second is a vapour lock on the engine side of the thermostat. These engines are quite difficult to bleed. There's two bleed ports - one is one the engine cross pipe at the back of the block. When looking down from above standing at the front of the car, it is off to the right below the throttle body area. You will see a black pipe with a small silver allen key screw on the top. these are quite fragile and often round out the allen key, so be gentle and don't overtighten when putting back in. To bleed this area, simply remove the bolt until colant is flowing freely from this hole and simply put back in!
The second is on the left hand heater hose where it enters the heater core on the plenum above the firewall. There should be a small white circle sowing the location of a hole in the hose. undo the hose and expose this hole just beyond the end of the heater core pipe (small screw driver, pin or allen key etc in the hole will let you know when you're there). Ensure the coolant reservoir is above this level (undo it to raise it up, or put some sort of neck extension on the cap) and fill until water flow out of this hole freely.
Push hose back on and retighten and bleeding should be done.
Thirdly the thermostat itself could be cactus. This is a big job to replace (pretty much a timing belt job to get to it, which is why it's a recommended replacement item at a timing belt change) and I would only do it if absolutely certain it was at fault. The thermostat is located in the front of the block, just to the left hand side (looking from front) of the water pump. It is at the top of the alloy tube which the bottom hose connects to.
Posted on Jun 21, 2012
To be honest, I don't have any experience with the 2.6, but from the sounds of it, you have coolant flow through the upper hose (which would explain why it's hot) and none through the lower hose (which is why it's cold). One resource you could check is www.vagcat.com - sign up (free) for your car and drivetrain, and it should show you everything you need.
Posted on Sep 14, 2008
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