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The heater system in a Ford F150 uses the same plenum box as the Navigator and Expedition, so any information you find on those will apply also to the F150. The operation of the system is fairly basic with a fan to blow air through the AC evaporator core followed by a blend door that can divert the air flow into the vent system or through the heater core...or any combination in between. You have mas heat when the AC compressor is off and all air diverted through the heater core, and max AC when the compressor is on and flow is blocked through the heater core. The blend door can regulate between those two extremes to get any temperature mix desired by the driver.
The most common fail mode for the system is a broken blend door. The door is on a vertical axis and when the axle connection breaks(most common failure) the door can swing back and forth randomly, controlled by turns, speed, air flow, gremlins, etc. The deal fix for this problem requires removal of the dash and plenum box, disconnecting the refrigerant system and draining the radiator. It ends up being an expensive repair, not because of the cost of the replacement parts, but the labor involved in getting to the box.
Check out HeaterTreater on Ebay or at heatertreater.net for diagnostic procedures to check the operation of the blend door and a cheap easy fix for the problem.
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∙ 15y ago
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