Question about 1999 Ford F150 Regular Cab

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Heater runs all the time, even when heat turned to off, no ac either anymore. this is on a 1999 ford f150

Please help, heat on all the time, just started, heat is on even when turned to off. no ac either just hot air

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Sounds like an issue with your diverter door under your dash is stuck in heat mode. When you turn on a/c, the door should close off the heater core section and open up and let your evaporator (a/c) open . You will have to figure out if its your controller or the door. Older units used cables and had no issues. Yours probably has electronic control /motors, etc.

Posted on Mar 31, 2014

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ford you say


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