76 heater blower motor won't run on high? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72k5zl1** · 02-01-2016, 09:07 PM

turning a 76 k5 into my daily. trying to get everything back in working order, blazer has factory ac. replaced dash controls, blower relay (3 of them), and the resistor, everything but high works. if we jump the relay it works. I'm going nuts. any imput would be great. thanks!

**72k5zl1** · 02-01-2016, 09:57 PM

got it. inline fuse on firewall. orange wire goes into harness and is red other side of inline holder. the two inches of orange out of the black loom were cruddy and couldn't tell.

**hatzie** · 02-01-2016, 10:22 PM

No high blower speed could be the blower relay. It's down low on the RH side of the big AC evaporator housing.

02-01-2016, 09:07 PM	#1
72k5zl1 Senior Member Join Date: Feb 2010 Location: bennington, vt Posts: 1,626	76 heater blower motor won't run on high? turning a 76 k5 into my daily. trying to get everything back in working order, blazer has factory ac. replaced dash controls, blower relay (3 of them), and the resistor, everything but high works. if we jump the relay it works. I'm going nuts. any imput would be great. thanks! __________________ website https://www.villagegarage.com/ truck guy in the whiskey world https://www.instagram.com/c10glen/?hl=en https://www.hemmings.com/stories/car...e-perfect-day/

02-01-2016, 09:57 PM	#2
72k5zl1 Senior Member Join Date: Feb 2010 Location: bennington, vt Posts: 1,626	Re: 76 heater blower motor won't run on high? got it. inline fuse on firewall. orange wire goes into harness and is red other side of inline holder. the two inches of orange out of the black loom were cruddy and couldn't tell. __________________ website https://www.villagegarage.com/ truck guy in the whiskey world https://www.instagram.com/c10glen/?hl=en https://www.hemmings.com/stories/car...e-perfect-day/

02-01-2016, 10:22 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 76 heater blower motor won't run on high? No high blower speed could be the blower relay. It's down low on the RH side of the big AC evaporator housing. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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