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Heater 91 gmc truck


jpark's Avatar
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06-13-02, 11:47 AM   #1  
jpark
Heater 91 gmc truck

I have a 1991 GMC 4/4 pickup. When I first turn the ignition on, or off, there is a flapping sound that comes from the heater area below the dash. It makes this noise for about ten seconds. If anybody has any ideals what it is, and how to fix it , I'd appreciate it. Jim

 
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Joe_F's Avatar
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06-13-02, 01:31 PM   #2  
Joe_F
Check the blend/vent door. Something's amiss with that.

 
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06-14-02, 01:36 AM   #3  
knuckles
Agree w/ Joe. Your truck has electronic climate control. The blend door is controlled by an electronic actuator. Sounds like the actuator has gone south. It's a pretty common problem.

 
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