1999 Chevy Blazer heat and cool

1999 CHEVROLET BLAZER
120,000 MILES • 6 CYL • 4WD • AUTOMATIC
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DCOVERSTONE01
  • MEMBER
  • 1 POST
the temperature will pulse from hot to cold and doesnt do it constantly but ste awhile and then you can hear it change from on setting to the other
Dec 11, 2009 at 4:21 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Check for a vacuum leak to the blend door which is located near the heater core.

Let me know what you find.

Joe
Dec 21, 2009 at 5:42 AM
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