5

  • Tiny
  • Anonymous
  • 2005 Chevrolet Silverado
  • 120,000 miles

5.3 Lt. Engine is running, initially with heater on BUT Blower motor off for 5 minutes. Then, I turn-on blower motor and hot air comes out, But for only 10 seconds, then blower moter air turns cold. During this operation, initially only one heater hose warm, then after blower motor is turned on both heater hoses and output air very hot. But shortly after a few seconds the output air turns cold. Is this a clogged heater core OR a damper, or electrical issue? Thank you for your support. Bill

Monday, November 5th, 2012 AT 1:11 PM

1 Reply

  • Tiny
  • hmac300
  • Expert
  • 44,341 posts

Check yoru actuators, one may be sticky or not working.

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Monday, November 5th, 2012 AT 3:25 PM

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