2007 Mercury Marquis

2007 MERCURY MARQUIS
90,000 MILES • V8 • 2WD • AUTOMATIC
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CARLUN
  • MEMBER
  • 1 POST
still cooling but blow on floor and not through the vents; but sometime will blow through the vent but just briefly
Apr 11, 2010 at 5:40 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
In this case you are looking for a vacuum leak. The vent doors are actuated by vacuum. If it is too low, it won't switch air flow direction. Check under the dash and the hood for leaks. Sometimes, you will hear a hissing sound with the engine running from the area that is leaking.

Let me know what you find.
Joe
Jun 10, 2010 at 7:31 AM
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