Heater

Tiny
LITALIEN1001
  • MEMBER
  • 1994 FORD E-SERIES VAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 335,000 MILES
My heater works fine but it won't switch from the defrost vents position. What could be wrong with it.
Monday, December 27th, 2010 AT 7:48 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,871 POSTS
It sounds like you have a vacuum leak. Air flow is directed by vent doors in the HVAC system. The doors are actuated by engine vacuum. If there is a leak, the defroster is the default setting. Check under the dash for leaks. With the engine running, you may get lucky and hear a hissing sound from the leak.
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Tuesday, January 18th, 2011 AT 7:39 PM

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