Question about 1999 Ford F150 Regular Cab
I have a 1999 F-150, 4.2L, V-6. The switch on the dashboard that controls the air direction to the vent, floor, defrost, etc. sends all the air all the time to the defrost. The other switches work fine. Can you help me?
You have a vacuum leak,defrost is the default postion,no vacuum to controls. Check the small black vacuum line that goes thru the firewall on the passenger side of the firewall and trace it back to see if you can locate a leak. It will go to a vacuum resivior then to the intake manifold.
Posted on Feb 16, 2009
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Posted on Jan 02, 2017
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