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x1957x

1997 f150 ford heat only works on high

6 posts in this topic

On my grandsons 1997 ford pick up with a 5.3, the heater gets hot but the blower fan only works when I turn it to high. Control module maybe?? Thanks

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Probably blower resistor.

Edited by vermilionfox

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Quote

as in. Where are they located? Are they on the blower fan power lead??

 

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On high the blower motor resistor is bypassed. With it working on high the power and ground are good. This leaves the switch and the resistor. My money is on the resistor. 

 

Remove it and ohm out 2 and 3, 2 and 4 then 2 and 1. If you find an open replace the resistor.

1476293475756-1969544105.jpg

Edited by JOHNBIGDOG

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The Blower resistor is located near the blower motor. It will have a four wire connector and two 8 or 7 mm screws holding it in place.

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My 2002 F250 did the same thing, the resister was rusted and shot. Replace it, it is easy.

 

Good Luck ,

Mike

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