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Old 01-02-2020, 08:36 PM   #1
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Brand: Thor Motor Coach
Model: Windsport 34E
State: North Carolina
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THOR #13360
F53 heater fan?

2015 Windsport 34E, F52 chassis. Anyone have any experience with the heater fan control ( in dash) ? The fan works on low speed but the speed doesn't change no matter what the setting is.
I assume that the switch would have voltage at each control location on the back of the switch?

It's a little cold in the front seats
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Old 01-02-2020, 10:22 PM   #2
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THOR #16471
Heater Fan Switch

It would seem your fan speed switch is defective (or bad connection some where) IF it only works on low. Low speed indicates the fan motor resistor ass'y is intact, but the speed switch is not selecting fewer resistors (for a higher speed). Do a internet search on "2015 Ford F52 heater fan resistor schematic" for further info., there are some videos too.

Generally the same system has been used for years and in different models so don't be worried you might not find the exact info.


Stay cool
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Old 01-02-2020, 10:35 PM   #3
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THOR #16471



A typical schematic, here the ground comes in on the left through the Function Selector Switch up and through the three resistors and on to the blower motor, this is "low". Now to increase motor speed, the Blower Switch is dialed CW and this eliminates some resistors and so more current can flow to the motor. The selector switch is presently on "low" and is NOT doing anything... the current does not need the switch on low, it just goes through the resistors.


Stay cool
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Old 01-03-2020, 03:26 PM   #4
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Brand: Thor Motor Coach
Model: Windsport 34E
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THOR #13360
Success !!! Pulled the switch panel (two hard to get to nuts on the back flat head screws in front). Found 1 red wire loos from connector. pulled in works, pulled it out again and bend the clip on the connector to make it stay in place...good for now,
Again thanks for the pointers
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Old 01-03-2020, 07:18 PM   #5
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THOR #16471
Good Job!

Having an idea what the problem is with anything electrical can be the easy part... getting to the problem (usually behind the dash) almost always is difficult.



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Old 01-03-2020, 07:31 PM   #6
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Brand: Thor Motor Coach
Model: Windsport 34E
State: North Carolina
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THOR #13360
So while I was under the dash I decided to take a look to see why the driver side get very little air/heat. To look at the area near the heater required removal of the built in desk on the passenger side, of course I took out the screws on the bottom of the hinges and one was so crooked I had to remove the upper hinge to get the desk out of the way for the screw to be removed.
Once that was cleared up I got the 110 outlet loose, the 12v cig lighter proved to be hard because they didn't allow any extra wire to get a hand in to disconnect. Usesd a long screw driver and popped them off, easy peezy. Problem came when reinstalling, I couldn't get a hand in so I added 6" of wire. got it bad together. Still haven't found a reason to the low flow. I feel sure it's because they used too much hose to get from point A to Point B. I looked at the vent at the windshield and it had 3 bends it didn't need, The problem fixing it was the air box under the dash is screwed in from the bottom, without much room to get them out or remove and shorten the hose.
I'll pack extra socks for the winter drives and sandals for summer
End of rant
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