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I'm not sure of the question, but the power is a 5V feed from the HVAC control module in the center of the dash. There are two major problems with the F150 that need to be checked. First, the temp control knob has a tendency to break. It will feel like it is controlling the system, but it may not be. You'll have the remove the knob and check it closely. The second major failure is a broken blend door connection. Check the Ebay listing for HeaterTreater F150 for diagnostic information and a fix.

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17y ago

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