1999 Ford Windstar with no front heat

[4varellis]

My 1999 Ford Windstar only has heat in the rear. I have tracked the problem to a little white box in the dash, behind the radio. When you slide the temp selector from cold to hot, or vice-versa, the little box clicks like it just does not have enough power to do what it is supposed to.

This little white box has a small knob in the lower right hand corner with a recessed square hole. This knob feels like it has a shaft that comes out of the back and goes through the firewall to the engine compartment. There is a small black box and a small black plastic canister (about twice a big as a film canister) in the engine compartment, attached to the firewall, just opposite the white box. I assume the shaft from the white box goes onto the black box in the engine compartment? Is this correct?

I have also noticed if I move the selector from cold to hot, I can help the white knob rotate by inserting a screw driver and turning just a bit. This will engage the heater and blow hot air unless you move the selector switch back to cold. Then the white box clicks and only blows cold air.

I unscrewed the 2 screws on the white box assuming I could removed it and replace it, but the shaft coming out of the back seems to be attached and will not come off. I did apply just a little pressure to try and remove the white box, but was afraid to pull to hard. Any ideas as to how the white box comes off?

[12Ounce]

There are three screws.

[4varellis]

Originally Posted by 12Ounce

There are three screws.

Thanks. Don't know how I missed the third one. When I take all 3 out, will the white box come off easily, or should I expect to find it is attached to wires or vacuum hoses?

[4varellis]

Thanks. Don't know how I missed the third one. When I take all 3 out, will the white box come off easily, or should I expect to find it is attached to wires or vacuum hoses?

[12Ounce]

There's one elect connector. Fairly easy.