Heater 91 gmc truck


Old 06-13-02, 11:47 AM
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Lightbulb 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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Old 06-13-02, 01:31 PM
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Check the blend/vent door. Something's amiss with that.
Old 06-14-02, 01:36 AM
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Thumbs up

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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