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2001 Ford Expedition Lack of heat from the front panel

Tiny
SCRATTRAY
  • MEMBER
  • 2001 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
While attempting to defrost my front windshield I noticed that there was no heat coming from the vent; however, it was still blowing and the rear passenger compartment, heat was working effectively. The vehicle already had the thermostate replaced. What else could it be?
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Thursday, September 17th, 2009 AT 3:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
IT sounds like you have a vacuum leak. The vent doors are actuated by vacuum from the engine. If there isn't enough due to a broken, damaged, or disconnected hose, the vent doors won't open and close properly.

Check under the dash for leaks and throught the firewall where the vacuum source comes from, the engine. Sometimes, with the engine running, you can hear a hissing sound coming from a leak.

Let me know what you find.
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Tuesday, September 22nd, 2009 AT 10:29 PM

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