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Old 09-15-2013, 09:40 AM   #6
motornut
78K & 79C Jimmys
 
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Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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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1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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