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I am baffled. My 2000 AUDI A6 2.7T overheats when I turn down the heater. If I do not keep a steady speed the car overheats. When I slow down the car overheats. I suspect thermostat is faulty as there are no leaks as I had the system pressure tested. I can drive 500kms and the car is fine. Suddenly when I slow down or stop, it overheats. Please help!

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  • Yuri Grant Roper Jul 07, 2010

    Very helpful. Thanks

  • Yuri Grant Roper Jul 08, 2010

    So I took my 2000 AUDI A6 2.7T to a radiator specialists, and after testing discovered it is not the head gaskets (as the agents told me), not the water pump (which they replaced at great expense), not the thermostat(which they replaced), but the viscous coupling on the fan. So that when the car stops or slows down, it overheats. I am in the process of changing this coupling and will let you know what the result is. Why did the dealer not pick this up????



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First check out the coolant level if it is low then this can be the reason of car overheating.Also get the radiator cap checked if its loose or worn out it can be the reason for car overheating.Also get the water pump checked if its loose or blocked then low water flow may cause car to over heat. I agree that you got the no leak pressure test and found nothing but if the coolant level is low then car will overheat.If everything check out OK, then check whether the thermostat fan is running or not if not then its the faulty part.Check and confirm whether the fan comes up when the temperature rise.If the fan comes up then its not the faulty part and thermostat is the faulty part it has to be checked and replaced to solve the problem.

Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 07, 2010

  • Yuri Grant Roper Jul 07, 2010

    The dealer told me they changed the thermostat (which I doubt), and since then I have had this problem. They also changed the secondary waterpump (at great cost!). I suspect thermostat. I will have it changed immediatley and let you know. Thanks



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