Question about 2009 Audi A8

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AC blowing warm air after restart in my S8

After stopping my S8 for half an hour or so, upon restart the a/c blows very hot air for a couple of minutes before suddenly going cold. The Audi dealer says they can't replicate the problem and are close to giving up. This is in Miami and my wife and people in my office hate to drive in the car because of the discomfort of having to endure heat blowing on them. Any ideas? Thanks!

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  • 179 Answers

LET YOU TECHNICIAN MEASURE THE GAP ON COMPRESSOR CLUTCH.IS COMMON IF THE GAP IS TO BIG COMPRESSOR ENGAGE LATE.AFTER 2-3min.
LOCATE THE SENSOR FOR CABIN TEMPERATURE AND MAKE SURE IS NOT DUSTY . LET THE DEALER PLUG THE SCANNER AND READ THE LIVE DATA BEFORE START THE CAR.BAD OR DISCONNECTED SENSOR WILL READ -40*F. SELECT LIVE DATA AND WILL SEE THE SIGNAL FRO THE BODY CONTROL MODULE TO A/C RELAY(ON / OFF)
ENGINE DATA IS IMPORTANT TO. A/C CUT OFF ON OVERLOAD FROM ENGINE,POWER STEERING,ETC
.

Posted on Mar 29, 2014

Testimonial: "Many thanks, Wolf! It was kind of you to take the time to reply. I will convey your recommendation to the dealership and hopefully get my car back soon."

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 45 Answers

SOURCE: 1997 audi A4 heater blowing cold air

You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Posted on Nov 13, 2008

  • 651 Answers

SOURCE: 96 audi a4 blowing cold air

yes, very possible. but first check your fluid level, thermostat.

Posted on Dec 06, 2008

emjem74
  • 162 Answers

SOURCE: we have an audi a4 2.6cc , the heater only blows

sounds like the thermostat is not functioning correctly? either that or not in at all? thus making the water which would normally warm up quickly, warm up extremely slowly and on really cold days not at all? with a 2.6 engine your car shoudl warm up in record time?

Posted on Mar 04, 2009

  • 144 Answers

SOURCE: 2002 audi a4 1.8t heat problem.

most likely a air bubble in your system. get it up to temp open up your reservoir use something that will fit in the opening and put coolant into it rev engine up a bit until you see bubbles coming up. when you did the engine did you replace cooling system parts like t-stat or water pump? purging the system of air will take a little while good luck hope that helps

Posted on Sep 05, 2009

  • 534 Answers

SOURCE: Hot air blows but cools down in 15-20 seconds.

You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Posted on Nov 13, 2009

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