Heater Control

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Feb 14, 2006 | 09:54 AM

cfb61

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Joined: Feb 2006

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Heater Control

I have a 90 F150 w factory ac. no matter where you set the vent selector control, all the air comes out the defrost vents. Any suggestions on where to search for problems? The vaccum swith on the control? Door motors?

Feb 14, 2006 | 10:31 AM

projectSHO89

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Joined: Oct 2002

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From: St. Louis (Out in the woods)

You've most likely lost the vacuum supply from the intake to the HVAC control head.

Look for a loose, broke, cracked, or split hose that runs through the firewall.

Steve

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