a/c help 73 gmc p/u - The 1947 - Present Chevrolet & GMC Truck Message Board Network

frankyjoet · 12-14-2016, 03:10 PM

i have a question about the fan cage hole on the firewall. i have a wider fan cage bought from autozone attached on my new a/c/ heater motor. Do i have to make the whole larger on the firewall. i know the motor gets attached to the evap housing. Is the old hole opening now good for air flow? thanks for any help. I am ready to install the evaporator , fan motor and housing to wall.

frank 73 gmc 350 rv old granny 4 spd 3/4 ton

ratskin · 12-15-2016, 08:49 AM

IIRC, the fan will not go straight in. you have to tilt and "tuck" it in.

frankyjoet · 12-15-2016, 05:13 PM

RATSKIN, the hole opening is 5" round. the fan cage is bigger. there is not much room inside the hole for the cage to spin. When i attach the fan motor and cage to the housing , there is clearance for the fan to spin inside the housing. I can make the hole bigger, if necessary. Another scenario to buy a narrower cage.

thanks frank

**hatzie** · 12-15-2016, 07:53 PM

Sounds like the fan they sold you is the wrong one for the heater housing.
Take it back and tell em you want one that fits.

frankyjoet · 12-16-2016, 05:05 PM

Thanks for all your help. i bought a shorter motor wheel. this should circulate the air through the housing , the passenger side damper and the windshield cowl. frank HAPPY HOLIDAYS

12-14-2016, 03:10 PM	#1
frankyjoet Registered User Join Date: Feb 2008 Location: Surprise, Ariz. Posts: 186	a/c help 73 gmc p/u i have a question about the fan cage hole on the firewall. i have a wider fan cage bought from autozone attached on my new a/c/ heater motor. Do i have to make the whole larger on the firewall. i know the motor gets attached to the evap housing. Is the old hole opening now good for air flow? thanks for any help. I am ready to install the evaporator , fan motor and housing to wall. frank 73 gmc 350 rv old granny 4 spd 3/4 ton

12-15-2016, 08:49 AM	#2
ratskin Registered User Join Date: Oct 2006 Location: Western IL Posts: 358	Re: a/c help 73 gmc p/u IIRC, the fan will not go straight in. you have to tilt and "tuck" it in.

12-15-2016, 05:13 PM	#3
frankyjoet Registered User Join Date: Feb 2008 Location: Surprise, Ariz. Posts: 186	Re: a/c help 73 gmc p/u RATSKIN, the hole opening is 5" round. the fan cage is bigger. there is not much room inside the hole for the cage to spin. When i attach the fan motor and cage to the housing , there is clearance for the fan to spin inside the housing. I can make the hole bigger, if necessary. Another scenario to buy a narrower cage. thanks frank

12-15-2016, 07:53 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,970	Re: a/c help 73 gmc p/u Sounds like the fan they sold you is the wrong one for the heater housing. Take it back and tell em you want one that fits. __________________ 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.

12-16-2016, 05:05 PM	#5
frankyjoet Registered User Join Date: Feb 2008 Location: Surprise, Ariz. Posts: 186	Re: a/c help 73 gmc p/u Thanks for all your help. i bought a shorter motor wheel. this should circulate the air through the housing , the passenger side damper and the windshield cowl. frank HAPPY HOLIDAYS



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