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Re: Heat and A/C switch
Go to a Toyota dealer an purchase a "Heater Fan Motor Resistor"; yours is bad. Remove the cover under the glove box, and you will see it on the side of the tube from the blower assembly that runs to the center of the dash. Held in with 2 screws. Easy to change. Once you get it out, you will see where it is bad.
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Have you checked your heater control valve. this valve is what controls the flow of coolant threw the heater core. check the lines inside the engine compartment to see if they are warm before and after the heater valve . You may also have a HVAC control module that is causing your control head and blend doors not to work correctly.
You'll find about three phillips screws on the door panel; remove those. Then start lifting the panel vertically with some vigor. Peer in around where it gets loose and you can see the clips move up an inch or so and once those start freeing up you'll feel the panel coming away from the door. More often it's the switch that's gone bad, not the motor. Look at the clips holding the back of the switch on, and work that off. Look at which is the driver's switch and with a piece of jumper wire, substitute that for the switch. If you can get the motor to work, you've found that the switch is what's bad and you can get a new one at the Ford dealer. Before doing all that though , make sure that the wires passing through to the car body aren't visible, hence broken or shorted. Have a friend over to help, do this in good light and have fun.
There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.
I had the same problem in my 1991 caddy, and turned out to be the blend door. It is located in back of the glove compartment. There are two kinds, the automatic blend doors and the manuel ones. Since the temperature is automatic and programmed to stay where it is set, it would be an "automatic blend door". Not a hard fix...