1999 Lincoln Navigator A/C Blows through Defrost during acc

ArizonaNAV · Posted at Thu May 08, 2008 8:32 am

Air Conditioning problem
1999 Lincoln Navigator V8 Two Wheel Drive Automatic 150000 miles
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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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merlin2021 · Posted at Thu May 08, 2008 11:19 am

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.