2000 Chevy Blazer Heater trouble

Tiny
NIEMEYER84
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 168,000 MILES
Quick question: What could be the cause of my heater only working if I am moving at a constant speed of around 60mph or more?
Friday, December 5th, 2008 AT 3:56 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi:
One of the most common reasons heaters only heat when the RPM's are high is due to low coolant. If you checked that and it's fine, keep an eye on the temp gauge and make sure the engine is staying in the normal operating section. If it's running cool, replace the thermostat.

Joe
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Sunday, December 7th, 2008 AT 12:53 AM

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