Heater fan works on high speed only?

2007 FORD RANGER
6 CYL • 2WD • AUTOMATIC
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ALPHONSUS
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  • 2 POSTS
Heater fan works on high speed only. Replaced the resistor and checked fuses still not working. Is there a relay and where is it? What about the speed control switch, how do I check it or replace it?
Nov 16, 2010 at 1:24 AM
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WRENCHTECH
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  • 20,761 POSTS
It has a relay but that supplies full time power. the speeds are controlled on the ground side by the switch and the resistor. Lets replace the blower fan resistor that should fix it. Check out the diagrams (Below). Please let us know what happens.
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Nov 16, 2010 at 1:36 AM