I HAVE A 2000 CHEVY SILVERADO. AT FIRST MY HEATER ONLY BLEW
THEW THE COUNSEL AND IT WAS WARM AIR, NOW IT ONLY BLOWS
COLD THROUGH THE VENTS TOWARDS U FACE AND NO AIR TO
DEFOST. ALL COLD AIR .
Sounds like a blend door actuator that controls the vent door may be bad.
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