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-   -   Heater fan only works on high (http://67-72chevytrucks.com/vboard/showthread.php?t=755613)

72 5500 01-25-2018 04:46 PM

Heater fan only works on high
 
The heater fan on my 97 only works on high. Is the switch bad or maybe a fan relay?

Mr_Rich 01-25-2018 05:54 PM

Re: Heater fan only works on high
 
1 Attachment(s)
This was copied from my schematic diagram book.

b454rat 01-25-2018 07:08 PM

Re: Heater fan only works on high
 
Resister. My 'hoe did the same thing, then nothing. Replaced it with good junkyard piece, now works on all settings.

hutcholdschool 01-25-2018 10:14 PM

Re: Heater fan only works on high
 
I would guess it is most likely the blower motor control module resistor. I had one fail on me and had the same symptoms as you.

72 5500 01-27-2018 04:48 PM

Re: Heater fan only works on high
 
Sounds easy enough, thanks


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