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1998 Lincoln Navigator A/C problem

Tiny
COMMANTH
  • MEMBER
  • 1998 LINCOLN NAVIGATOR
  • V8
  • 2WD
  • AUTOMATIC
  • 95,400 MILES
A/C works fine until blower motor speed is increased or heavy acceleration and then blows hot air. Turn off & press automatic same thing again, as long as I keep blower motor on low speed cool air will come from the vents. I can hear what I believe to be an opening/closing of a vent door in the dash. Any suggestions?
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Thursday, August 13th, 2009 AT 8:07 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
The vents in the dash are operated by vacuum. THe one door, the blender door, opens and closes based on if you want heat or AC. Chances are there is a vacuum leak to it or inder the dash allowing it to change directions when under an acceleration. When you place that type of load on the engine, the vacuum in the intake drops (normal) and if there are any leaks, other vacuum related systems are affected by it.
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Monday, August 17th, 2009 AT 10:10 PM

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