F-250 blower motor speed problem


Old 10-22-06, 01:29 PM
mlf is offline
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Join Date: Mar 2004
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F-250 blower motor speed problem

I have a 2000 F250, my heater--a/c blower motor will not run on the high speed when set to heat, it works only on the first three settings. However, when set to A/C and on Max the fan does blow at high speed.
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Old 10-22-06, 04:01 PM
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Join Date: Sep 2006
Location: USA
Posts: 418
I'd eliminate the blower motor as the cause since it runs at high when the A/C is running.

The only other thing I know that could cause this would be the switch itself. This assumes that the fan is controlled separately by the heater controls and the A/C controls.

Sometimes rapidly moving a switch back and forth will cause it to operate.

One other thought: maybe it's a blown fuse. Not likely, just a thought.

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