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09-06-2013, 01:43 AM
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#1 |
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Senior Member
 Join Date: Feb 2012
Location: Tucson, Az.
Posts: 395
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A/C fan motor problems.... Need help! 1977 Blazer
A/C fan motor problems.... Need help! I'm working on my 77 Blazer. With all A/C and heat levers in the off position my blower motor still runs on a very low speed. I have a couple ideas but I'm hoping someone knows the answer before I start throwing money at switches and relays! Thanks in advance.
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09-06-2013, 02:57 AM
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#2 |
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78 Big10 454
Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 839
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Re: A/C fan motor problems.... Need help! 1977 Blazer
My 78 C-10 was equipped with "Astro Ventilation". Don't know if it was standard in 1977. My blower always ran on low speed when the ignition was hot.
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1978 Chevy SWB C-10 2WD 454/400 |
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09-07-2013, 03:16 AM
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#3 | |
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Senior Member
Join Date: Feb 2012
Location: Tucson, Az.
Posts: 395
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Re: A/C fan motor problems.... Need help! 1977 Blazer
Quote:
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09-07-2013, 08:55 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: A/C fan motor problems.... Need help! 1977 Blazer
My '73 did this also. thought I read it was for fresh air circulation. I know recently there was another thread on this. This was on AC and non AC. IIRC someone did use a 4 position switch off a later model truck that would shut it off. Personally, I just live with it, or unplug the blower. (won't blow if there's no power.
 )
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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09-14-2013, 11:30 PM
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#5 |
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Senior Member
Join Date: Feb 2012
Location: Tucson, Az.
Posts: 395
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Re: A/C fan motor problems.... Need help! 1977 Blazer
Thanks to all for the help. I still think having the fan motor running all the time is silly!
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09-15-2013, 09:40 AM
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#6 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: A/C fan motor problems.... Need help! 1977 Blazer
in a brochure it's called power venting or something close
keeps the fumes out,fresh air in very annoying i find i just cut the brown low speed wire on both the non-ACs 78/79s 78 3 speed/79 4 speed
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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