Heater Problems

Tiny
BEACHIN2009
  • MEMBER
  • 2002 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
My heater on my 2002 Ford Expedition blows out the defrost vents but not my front vents. What would cause this?
Wednesday, December 29th, 2010 AT 10:03 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Check for vacuum leaks under the dash. The vent doors are actuated by vacuum. If there is a leak, this will happen. When checking, start the engine and listen. If you are lucky, you may hear a hissing sound where the leak is located. NOTE: Make sure to do it in a well ventilated area.
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Monday, February 7th, 2011 AT 7:52 PM

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