2004 Other Chevrolet Models Heater stops working when not ac

2004 CHEVROLET
30,000 MILES • 6 CYL • 4WD • AUTOMATIC
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ANGELGREATFUL
  • MEMBER
  • 1 POST
My chevy's heater only works when I am accelerating the vehicle. If I am going down a hill, or I am at a stop light, the heater starts to blow completely cool air. It goes from very warm to cool air in a matter of seconds.
My tempurature gauge looks fine although it may be very slightly higher than usual. The motor sounds fine, although the airconditioner sounds a bit noisier than it use to. This is a chevy Tracker.
Oct 30, 2008 at 9:44 PM
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2CARPRO JACK
  • ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
Sounds like a flow problem with the heater core.Try having the heater core back-flushed by a radiator shop to see if it is restrictive.
Oct 31, 2008 at 8:15 AM
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