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Heater box door

Tiny
JAMES LAWRENCE
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 120,000 MILES
Makes a slapping noise when starting and when shutting off the engine for about 30 seconds. The noise seems to be behind the heater motor. Is this an electrical or a vacuum problem?
Thursday, June 6th, 2013 AT 4:15 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a vacuum motor disconnected or a vacuum leak there.
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Thursday, June 6th, 2013 AT 5:58 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
This one is all electric so you likely have a stripped out actuator motor and possibly broke or stuck door.
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Thursday, June 6th, 2013 AT 6:50 AM

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