1997 Mercury Mountaineer No air blowing from dash board ven

Tiny
PORSCH1
  • MEMBER
  • 1997 MERCURY MOUNTAINEER
  • V8
  • AWD
  • AUTOMATIC
  • 149,000 MILES
I have an intermittant problem with air blowing from dashboard vents. Sometimes it works blowing hot air for heat and cool air for a/c. So I know the blower works ok. Most times nothing from vents or defrost or floor vents, when I turn selector to desired location. Rear controls and vents work fine. Weeks go by and it does nothing. Then one day I get in start the vehicle and I have air blowing thru front dash vents. I can't figure this out, can you help me?
Tuesday, May 26th, 2009 AT 11:00 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
THe vents are run by vacuum. You need to check for vacuum leaks under the dash and the hood.

With the engine running, you may hear a hissing sound from a leak.

Let me know what you find.

Joe
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Monday, June 29th, 2009 AT 4:16 PM

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