1999 Chevy Blazer servo vs computer

1999 CHEVROLET BLAZER
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CHATTERTONRK1
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Heater problem
1999 Chevy Blazer 6 cyl Four Wheel Drive Automatic

My truck has developed a nasty and unfavorable condition to wit: When the motor is running, the heater blows hot and cold, with the sound of the pass door under the dash creaking, opening and closing in a continual loop. Is this from a computer malfunction, or is there a servo to operate that flap that may be stuck in a loop?
Oct 30, 2010 at 1:48 PM
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HMAC300
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there is a servo , actually two on the heater . they can be vacuum or electric. if it continues toopenand closeit's probably vacuum and hou have a leak..........
Oct 31, 2010 at 7:53 PM