heater box door

1994 CHEVROLET SILVERADO
120,000 MILES
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JAMES LAWRENCE
  • MEMBER
  • 1 POST
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?
Jun 5, 2013 at 9:15 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check for a vacuum motor disconnected or a vacuum leak there.
Jun 5, 2013 at 10:58 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
This one is all electric so you likely have a stripped out actuator motor and possibly broke or stuck door.
Jun 5, 2013 at 11:50 PM
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