New blower motor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chrismoore701 · 03-04-2018, 09:05 PM

Looking to get a new blower motor for my 79 stepside. Frame off show truck. I want to get an ac delco. Couple to choose from. The main two are with ac and without ac. Ac is like $100 where non ac is about $50. I have ac but not hooked up. What is the difference? Do i need the ac fan?

chrismoore701 · 03-06-2018, 08:37 AM

It’s getting cold in here.

zach_carver · 03-06-2018, 09:07 AM

I think a/c blowers and a/c control head operate a little different. If you have a factory a/c system I would buy the correct one. Im not sure on the technical differences though

BHTH · 03-06-2018, 04:53 PM

I wonder if it has something to do with the fact that there is no off position for non-AC trucks, at least that is how it is on my 78. The fan always runs. I would think the blower motor itself wouldn't be different. I'll look at my wiring diagrams tonight and see if I can come up with something. It could be a physical difference based on space constraints. I would go with the AC one though in any case.

BHTH · 03-06-2018, 05:12 PM

LMC truck shows the same part number for both for 79 for some cases There are some differences that have to do with vent hole diameter that could be the difference. Other than that, the difference is in the resistor block which is what I would expect. Also the FAN sizes are different is some cases.

http://www.lmctruck.com/icatalog/csb/full.aspx?Page=179

chrismoore701 · 03-06-2018, 07:57 PM

Quote:

Originally Posted by BHTH

LMC truck shows the same part number for both for 79 for some cases There are some differences that have to do with vent hole diameter that could be the difference. Other than that, the difference is in the resistor block which is what I would expect. Also the FAN sizes are different is some cases.

http://www.lmctruck.com/icatalog/csb/full.aspx?Page=179

Isn’t the resistor block on the heater box?

chrismoore701 · 03-06-2018, 10:39 PM

Quote:

Originally Posted by BHTH

LMC truck shows the same part number for both for 79 for some cases There are some differences that have to do with vent hole diameter that could be the difference. Other than that, the difference is in the resistor block which is what I would expect. Also the FAN sizes are different is some cases.

http://www.lmctruck.com/icatalog/csb/full.aspx?Page=179

Isn’t the resistor block on the heater box?

BHTH · 03-06-2018, 11:20 PM

Quote:

Originally Posted by chrismoore701

Isn’t the resistor block on the heater box?

It is out on the duct in the engine compartment with the blower motor. Oh and the wiring diagram doesn't show anything difference for AC vs non-AC.

Bandit130 · 03-06-2018, 06:04 PM

Quote:

Originally Posted by zach_carver

I think a/c blowers and a/c control head operate a little different. If you have a factory a/c system I would buy the correct one. Im not sure on the technical differences though

x2

chrismoore701 · 03-07-2018, 01:53 PM

I think i will pull the old one off. Take it down and compare.

tucsonjwt · 03-07-2018, 03:14 PM

Have you checked Rock Auto? There are several different ACD blower motors available. The descriptions may help you. If you buy one there, remember to use their 5% discount code - google it to find the current code.

https://www.rockauto.com/en/catalog/...wer+motor,6916

03-04-2018, 09:05 PM	#1
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	New blower motor Looking to get a new blower motor for my 79 stepside. Frame off show truck. I want to get an ac delco. Couple to choose from. The main two are with ac and without ac. Ac is like $100 where non ac is about $50. I have ac but not hooked up. What is the difference? Do i need the ac fan? __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-06-2018, 08:37 AM	#2
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	Re: New blower motor It’s getting cold in here. __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-06-2018, 09:07 AM	#3
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: New blower motor I think a/c blowers and a/c control head operate a little different. If you have a factory a/c system I would buy the correct one. Im not sure on the technical differences though __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

03-06-2018, 04:53 PM	#4
BHTH Registered User Join Date: Nov 2017 Location: Butler, PA Posts: 56	Re: New blower motor I wonder if it has something to do with the fact that there is no off position for non-AC trucks, at least that is how it is on my 78. The fan always runs. I would think the blower motor itself wouldn't be different. I'll look at my wiring diagrams tonight and see if I can come up with something. It could be a physical difference based on space constraints. I would go with the AC one though in any case.

03-06-2018, 05:12 PM	#5
BHTH Registered User Join Date: Nov 2017 Location: Butler, PA Posts: 56	Re: New blower motor LMC truck shows the same part number for both for 79 for some cases There are some differences that have to do with vent hole diameter that could be the difference. Other than that, the difference is in the resistor block which is what I would expect. Also the FAN sizes are different is some cases. http://www.lmctruck.com/icatalog/csb/full.aspx?Page=179

03-07-2018, 01:53 PM	#10
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	Re: New blower motor I think i will pull the old one off. Take it down and compare. __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-07-2018, 03:14 PM	#11
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: New blower motor Have you checked Rock Auto? There are several different ACD blower motors available. The descriptions may help you. If you buy one there, remember to use their 5% discount code - google it to find the current code. https://www.rockauto.com/en/catalog/...wer+motor,6916

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