The temperature control module in your 1997 ford explorer 8 cyclinder is constantly in high heat the switch for air flow works but if you switch to ac it blows hot air however the max ac blow cold air?
You have a broken temp blend door in your heater/AC case. The reason it blows cold when you switch to MAX is because in the MAX position, the heater control valve shuts off coolant flow through the heater core. You will need a new heater case, because the door is inside the case and is not available separately. You had better replace the blend door actuator as well, because that is what I have found is causing the door to break to bgin with. The stops wear out in the actuator so that it begins advancing too far in one direction or the other and it breaks the doors. Allen’s Alternate Repair — zero cost. Involves duct tape! (that’s a plus for many of us). I was facing that and my car isn’t worth the $750 est I got from the Ford dealer. I know there is an article on replacing the door through the firewall, but I didn’t know how to take of the ‘evaporator.’ If you go that way the part is $11.00 from NAPA but it does not look easy. The cheap way: 1) Drop the glovebox (push rubber stops inw
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