Question about 1996 Audi A6

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Heat control problem,ac works sometimes

I have a 1996 audi a6 and the heater is unable to turn down,it says its turning down but doesnt.I can still adjust the flow of air though.And when I turn on the a/c it still blows out hot air .And the funny thing is somedays it works like it is supposed to,you know like when I take it in to get looked at!!Please help???

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When you turn key on heat runs all the time,could it be heat/ac control unit?

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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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.

check the link



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I have a 1998 audi a6 my windows wont go down my blower doesnt work for my ac and heat and my dome lights down work


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Something to try. allow the engine to run for 6 to 8 minutes with the heater wide open, then, turn the engine off and reach back and feel the 2 hoses at the firewall that lead to the heater core. If only 1 is hot you do have some blockage, if both are hot then it is circulating properly and your problem lies somewhere else.

Dual zone systems also have a split door between the heater core and a/c evaporator that often stops functioning properly and it can block the hot air comming from the core.

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