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Old 02-05-2023, 06:59 PM   #1
mehoff400
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Join Date: Apr 2015
Location: Puyallup WA
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heater fan doesn't work on high setting

recently replaced the fan speed switch and it still seems my fan doesn't work in the high position any thoughts on what to check?
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Old 02-05-2023, 11:38 PM   #2
bigdaddy4x4
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Re: heater fan doesn't work on high setting

the blower motor relay controls the high side of the blower motor its rite by the blower motor check it out
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Old 02-06-2023, 11:25 AM   #3
temp190
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Re: heater fan doesn't work on high setting

Had issue with high on mine and only thing i found was ground near blower motor bad, repaired and it started working again.
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Old 02-06-2023, 12:40 PM   #4
Dead Parrot
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Re: heater fan doesn't work on high setting

Make sure any fuses or links on the full speed wire from the junction block are still good.
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Old 02-06-2023, 11:59 PM   #5
mehoff400
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Re: heater fan doesn't work on high setting

Figured it out. I installed a painless kit and painless heater a/c harness. I didn't realize the painless kit uses a ground and its own relay for the heater and apparently it only uses the relay on high and didn't have the ground connected. Once I hooked it up correctly everything works as it should
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