Question about 1998 Ford F150 Regular Cab

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1998 F150. Blower fan only operates at high speed. Nothing at low or intermediate switch settings. What is the problem?

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Hi!!

The problem is the Blower Motor Switch/Resistor. Replace it. $20 at AutoZone or similar Auto parts store.

Good Luck!! Don't forget to rate this post!!

Posted on Sep 03, 2010

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Try you manual for the blower relays' positions. Try swapping with the horn relay to test if it is the same type of relay.
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Switch is harder to test because hard to get at, check the other things first.
You should be able to test for voltages at the resistor plug to see if power is coming from the switch, but wiring schemes can vary.
Post back or use shop manual to troubleshoot the switch.

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