Question about 1996 Audi A6

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At idle speed heater blows cold increase rpm heater blows hot

When temp is at normal heater blows cold at idle speed, increase revs/drive vehicle heater blows hot.System has been flushed and new anti freeze added, and system self bleeds and no signs of leaks or pump noises. What is the problem, some say heater control valve, thermostat, thats new

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  • Audi Master
  • 1,127 Answers

Usually it's a leaky thermostat allowing to much coolant to pass through it when it's closed.To check this, clamp off top rad hose completely(acting like a closed thermostat) If you have hot air from the heater now ,you do need a replacement thermostat.

Posted on Mar 22, 2018

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 96 audi a4 heater blows cold air

you have air in the system!! you have to unbolt the filler tank and lift it 5 inch higer first. then loose the right hose on the heater core( this hose have and hole to bleed the system) and then put antifreeze until the antifreeze will go out of the hole then re install the hose to the heater core, then ajust the level correcty
have fun
jean-martin

Posted on Feb 05, 2009

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

  • 1 Answer

SOURCE: Car revs up to 3000 rpm when I start it. I have unplugged the idle control valve and it makes no difference

It is an electrical relay problem, that is part of the EFI system, I had an Audi of about the same age with the same problem many years ago. The relay was under the dash to the left of the steering wheel. Sorry, can't be more precise, but the dealer at that time had the relay in stock and one mechanic at the dealer gave me enough info to find the relay and replace it, and that solved the problem

Posted on Apr 20, 2009

  • 630 Answers

SOURCE: aud1 a4 2005.heater blows cold all the time

Sounds like the valve to the heater matrix is jammed shut, the actuator has burnt out or a blocked heater matrix. Trace the smaller diameter pipe from the thermostat housing and see if you can manually operate the valve.

Posted on Nov 28, 2009

flbergeron68
  • 541 Answers

SOURCE: overheating a4

install a thermostat, it is vital to prevent over heating and over cooling

Posted on Jul 04, 2010

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