Question about Ford F-150
Inside the venting behind the control panel, there is a flap that directs the air flow. This flap is controlled by a vacuum operated actuator. The vacuum hoses that run the actuator also run to your controls. Check vacuum lines for cracks, check actuator with a vacuum pump tester, and lastly, remove venting cover and check that flap is not stuck.
Posted on Jul 27, 2009
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Posted on Jan 02, 2017
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