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Heater doesnt work, and A/C on all the time

Audi A6 The mid-sized Audi A6 model offers more room to the driver and passengers over the A4 line.

Heater doesnt work, and A/C on all the time

  #1  
Old 07-23-2018, 06:13 PM
1st Gear
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Join Date: Jul 2018
Posts: 4
Default Heater doesnt work, and A/C on all the time

Just bought my 2003 Audi A6 4.2 V8 Quattro but found that the heater doesnt work at all.
If the interior fan is on, then the A/C is on and only very cold air comes out.
There is no effect by changing the temp settings, fan settings or A/C on or off.
It appears that water is not circulating through the interior heater, even though the motor gets up to correct temp quickly.
I have bled the air from the cooling system, and have reversed flushed the interior heater. It is not clogged.
Any ideas for the cause ?

 
  #2  
Old 09-04-2018, 06:45 PM
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Join Date: Sep 2018
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Did you ever figure this out?? I'm having the same problem with my 2003 a6 3.0.... It'll be hot for a brief second and then the ac kicks on.
 
  #3  
Old 09-05-2018, 06:03 PM
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Originally Posted by Jacob Rezac View Post
Did you ever figure this out?? I'm having the same problem with my 2003 a6 3.0.... It'll be hot for a brief second and then the ac kicks on.
Yes, I found out it was 2 separate problems.
1. Heater hose was twisted and so no coolant was flowing through the heater.
2. Fresh air blower motor was worn and so worked intermittently. I removed the motor and cleaned the carbon brushes.
Now all works fine.
 
  #4  
Old 09-05-2018, 07:18 PM
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Join Date: Sep 2018
Posts: 2
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Awesome!! I'll give that last one a shot and see what happens!
 
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