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I have the exact same problem with my 1997 Ranger. All hot air, even when the AC is on full. I took it in to the shop for the professionals to have a look, and they determined that the problem was inside the heater box. Apparently, there's a gate that regulates how much heat gets routed into the cab. The hot/cold knob on the dash is supposed to adjust the ratio of hot to cold air. The problem with mine, they said, is that the arm connecting the actuator to the door is broken, (and just my luck, it's stuck in a position that gives me a cab full of hot air.) They told me they'd have to replace the whole heater box, which would be $800-1000 with labor. I told them I'd drive with my windows cracked open and my AC off. Now I just have to figure out how to get the heater box out and where I can get a replacement. It's probably vacuum actuated. Look for the little rubber vacuum line that goes to that door and see if you can find a leak or a disconnected hose. There may be a broken plastic "T" in there somewhere.

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Q: What if the heater on your 1997 Ford Ranger XLT won't go from hot to cold how do you get the door to move?
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