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1999 Chevy Blazer HEATER HOT AND COLD

Tiny
KBEMIS69
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
RECENTLY MY COMPUTERIZED CLIMATE CONTROL HEATER BEGAN BLOWING HOT AND COLD ALTERNATELY. I CAN HEAR THE CONTROL DOOR OPEN AND CLOSE CONSTANTLY. ALSO THE HEAT DOESN'T SHUT OFF WHEN TURNED DOWN OR OFF. COOLANT FINE. THERMOSTAT FINE.
Saturday, January 19th, 2008 AT 1:47 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
You will always have a small amount of heat from the vents while driving. You probably have a bad HVAC comtrol head causing your other problem.
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Saturday, January 19th, 2008 AT 5:21 PM

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