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1996 Audi A4 heater fluctuates, warm then cooler

Tiny
GB29927
  • MEMBER
  • 1996 AUDI A4
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 210,000 MILES
Installed new thermostat hoping that was the problem but I think its doing the same thing. It seems to get a little warmer when driving, but when idleing, it gets cooler again.
Sunday, December 13th, 2009 AT 10:55 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there, if you have replaced the thermostat already, then I would have the radiator cleaned and flow tested next.

Mark (mhpautos)
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Monday, December 14th, 2009 AT 1:37 AM
Tiny
GB29927
  • MEMBER
  • 2 POSTS
If radiator was plugging up and flow was down, would it overheat? After getting engine to operating temp. Both heater hoses felt warm. One of them felt hot, the other felt almost as hot. Temp on dash shows temp about half way on gauge.
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Monday, December 14th, 2009 AT 6:13 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
You can have a partial blockage and the temp will wander all over the place, I wouldd not expect it to be plugged, I am trying to access the heating system info to see exactly how it all works, this is not something that I am 100% familiar with.

Mark
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Monday, December 14th, 2009 AT 8:56 PM

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