Question about 2003 Ford F150 Regular Cab
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Posted on Jan 02, 2017
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
Posted on Mar 02, 2009
You did not mention if the system you have is electronic(digital control) or manual(control knobs) but what your problem is, is a vacuum leak. Defrost and heat or the default postions for no vacuum. If it works ok until you press max air Then you will need to check the outside blend door vacuum motor. It will be the white vacuum line going from the control head.
Posted on Jun 01, 2009
I had the same problem on my 2003 CV, took it to ford and found out it was the AC controller. The controller is the part you see on your dash, that allows you to switch between heat/ac etc.. Watch for the cost though, To have a new controller installed was approx $750
Posted on Jun 09, 2009
The Climate control system in your truck has a gate that changes postition in order to change the flow of air from your face to defrost. The door is actuated by vacuum. Yours is still working otherwise it would be on defrost all the time. So you do have partial vacuum to the actuator but not enough to keep it in position when on high. Sounds like you have a vacuum leak but not bad enough (yet) to totally disable the gate.
Posted on Jun 21, 2009
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