1999 Lincoln Navigator A/C Blows through Defrost during ACC

Tiny
ARIZONANAV
  • MEMBER
  • 1999 LINCOLN NAVIGATOR
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
When I accelerate in my Navigator, the A/C starts blowing through the defrost vents and not the dash. When I let up it will start blowing again through the the dash vents. Why does this happen?
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Thursday, May 8th, 2008 AT 11:32 AM

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Tiny
MERLIN2021
  • EXPERT
You have a vacuum leak, and it's between the reserve tank and the control head, this is the black vacuum line that runs thru the firewall out to the reserve tank. Or the tank has a hole in it.
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Thursday, May 8th, 2008 AT 2:19 PM

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