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01-25-2018, 04:46 PM
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#1 |
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Registered User
Join Date: Apr 2010
Location: Canaan Ct
Posts: 105
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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?
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01-25-2018, 05:54 PM
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#2 |
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Registered User
 
Join Date: May 2006
Location: Santa Maria, Calif.
Posts: 781
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Re: Heater fan only works on high
This was copied from my schematic diagram book.
__________________
1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
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01-25-2018, 07:08 PM
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#3 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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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.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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01-25-2018, 10:14 PM
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#4 |
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Registered User
Join Date: Jan 2014
Location: UT
Posts: 30
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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.
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01-27-2018, 04:48 PM
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#5 |
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Registered User
Join Date: Apr 2010
Location: Canaan Ct
Posts: 105
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Re: Heater fan only works on high
Sounds easy enough, thanks
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