Question about 2003 Audi A6

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Hi I have an Audi A6 2003 2.0L Sport. Its freezing here but the heater only pumps out lukewarm air - no matter how high I set it? The temp gauge barely rises above cold no matter how long I been driving. The garage said 'AIRLOCK' and ran it full rev and the gauge went up. but soon as I drove away put on the fan and zoom staright back down! Air takes ages to warm up and higher the fan colder the air? Help!

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  • micksar200 Dec 03, 2008

    Thanks going to try that now.......anything to sort it out before it gets much colder!!

  • zzafarr Dec 05, 2008

    On my 2002 Audi A4 V6 i have the same problem, heater does blow the air but it is not hot, however if i give the engline hi rpm (4k-5k) i can feel the hot air coming, but as soon as i go to to idle or low rpm heater gradually changes to cold air ( lukewarm air).

    Air conditioner works just fine, climate control seems to respond to the temperature change.

    Any idea ?




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The design of the heater core hoses on the V6 cause an air pocket to from in the supply hose. The hose enters the HVAC system next to the battery under the big plastic cover below the windshield. If you look close, the hose has a small hole in it in front of the clamp. Pull the clamp off and slip the hose back until the hole is exposed and have someone rev the car at 3000 rpm for about 3 minutes or until air stops bleeding out the hole and you only get coolant. Push the hose back on while the engine is still reved up and put the clamp back in place.

Posted on Feb 04, 2009

  • Craig Feb 04, 2009

    Spunds like the 2.0 needs a thermostat.


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Replace the thermostat , sounds like its not closing or does not have one , and make sure that your coolant is at least 50/50 (50% water,50%antifreeze ) if you got more water that antifreeze your system will freeze up in freezing weather

Posted on Dec 03, 2008


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