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ENGINE: 6.8 V10
DESCRIBE ISSUE.... A/C has three knobs. Fan Speed, Temperature, and Mode, including OFF. In any Mode but OFF, the A/C cools according to Fan Speed and Temperature knob settings, but air flow is always through Defrost Vents. I know Defrost is Default, the mode you get when there's no vacuum or the Mode valve fails.
I've found the vacuum supply line under the hood. There's vacuum to the connection where the tubing goes into the HVAC cabinet, engine compartment side. I need to get the "trim," "bezel" or whatever it's called, off to inspect the Mode valve/switch assembly. It runs from the left A/C vent, then Instrument Cluster, then a center vent, the HVAC controls (over the radio) then another center vent. The two center vents are above the engine doghouse. HOW does it come off? Two screws above the instrument cluster, remove headlight knob and nut, trim should pry/pull out. Right? But doesn't budge. What am I missing?
I have the Electrical and the Vacuum Diagrams. Vacuum shows a Reserve Tank, but where is it? With vacuum TO the HVAC cabinet, and no hissing inside the cabin, I think all I need is a Switch/Valve. I think the Valve will look like a Switch but with plastic vacuum tubing instead of wires...
If you can't reach it through the top panel, give the front panel a manly tug and see if it will budge. Be sure to yell "Ford" just before you yank it. Or just pry behind it a little at a time with a trim tool.