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start by changing out thr complete ac/heater panel on your dash.... this panel contains electric and vacum components.
i meant only the controls on thr dash....if you have 3 trucks swap them from one to another one..
Blower fuses: I would check the wiring to the switch. Is there an after market radio in the truck?Controls: Vacuum leak, or lack of.
I don't know what to tell you on the fan other than start putting a meter to it to find where the load is coming from.As for the controls, can you tell if anything is actually moving?