Fan speed switch doesn't work - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 06-15-2012, 06:07 PM Thread Starter
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Fan speed switch doesn't work

Yesterday when I started the truck, the fan speed knob worked. I drove about 2 miles to a meeting, got out and when I got back in, the knob turns, but the fan speed stays the same. It seems like it is stuck on the high side; maybe 4.

Any tips?

Thanks,

Brad
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post #2 of 6 Old 06-15-2012, 06:44 PM
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that is the default for when the controller goes south

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #3 of 6 Old 06-16-2012, 06:51 AM Thread Starter
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How hard is it to replace the controller and what does it cost?
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post #4 of 6 Old 06-17-2012, 01:57 AM
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Blower motor resistor is most likely what you need.
When it goes bad you only get high speed fan.
It's behind the glovebox.
Try the dealer or Rockauto.com
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post #5 of 6 Old 06-17-2012, 08:21 AM Thread Starter
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Cool. Ordered one!
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post #6 of 6 Old 06-22-2012, 07:30 AM Thread Starter
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Got part from Rockauto (fast and cheap - got some filters, too).

Still no workie! Stuck on fan speed 4. Checked harness. Checked connector. Everything looked fine.

What next?
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