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1993 GMC C1500 loud noise

Tiny
JONWON
  • MEMBER
  • 1993 GMC C1500
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
When I turn the ignition on a loud tapping noise comes from a flapper valve in the air duct right in front of the blower for about 30 seconds, then stops, then does the same thing when the switch is turned off.
Thursday, January 10th, 2008 AT 1:53 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Blend door actuator. Dealer should have it in stock, replaced a ton of them. It is right above the trans tunnel, look down low and you can see it, turn key on, with fingers on it and you will feel it clicking
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Friday, January 11th, 2008 AT 7:24 AM

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