99 e250 blower motor control switch issues
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Tuned
Joined: May 2010
Posts: 309
Likes: 1
From: Wilsonville,Oregon
took the fan out tested the plug under hood has 12.4v
then tested fan with some jumpers and it turned on you can hear that its going south soon, doesnt spin freely like the new one. feels like its grabbing.
now figured out a problem now that old fan is out and still works but only on high. so is it the resistor?
and what controls the flap behind the blower fan? just want to see what is defrost and vents. when it opens up.
good times thanks
then tested fan with some jumpers and it turned on you can hear that its going south soon, doesnt spin freely like the new one. feels like its grabbing.
now figured out a problem now that old fan is out and still works but only on high. so is it the resistor?
and what controls the flap behind the blower fan? just want to see what is defrost and vents. when it opens up.
good times thanks
Last edited by wizzy214; Jan 13, 2026 at 05:35 PM. Reason: spilled koolaid
Hotshot
Joined: Jul 2020
Posts: 10,268
Likes: 2,563
From: Near Salt Lake City
The springs (resistors) look okay but you need to test the thermal limiter
So,
Test the thermal limiter
The rocket looking thing with the green point
Those burn out and you only get high speed after that
If your motor does not turn freely, that will melt the switch
The thermal limiter just needs to be zero ohms and when they burn, they go open circuit
Radio Shack sells them for 10 bucks or so
Use your ohmmeter
So,
Test the thermal limiter
The rocket looking thing with the green point
Those burn out and you only get high speed after that
If your motor does not turn freely, that will melt the switch
The thermal limiter just needs to be zero ohms and when they burn, they go open circuit
Radio Shack sells them for 10 bucks or so
Use your ohmmeter
Thread Starter
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Tuned
Joined: May 2010
Posts: 309
Likes: 1
From: Wilsonville,Oregon
its gone, i have each connetor electrical taped, then taped all 4 together replaced the switch 3 times this way, but ordered a new harness so will replace tom. ill post a pic i know ill get laughed at.
Last edited by wizzy214; Jan 13, 2026 at 07:47 PM.
Mountain Pass
Joined: Sep 2023
Posts: 158
Likes: 8
On my '98 Strayhound it turned out to be the damnable Flapper Panel Door I modified/fixed with a manual control was preventing heat in the winter. The controlling motor uses only a few strands of wire to engage the Flapper door so a new part would've been a non starter for me.
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kc5hwb
1973 - 1979 F-100 & Larger F-Series Trucks
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