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Old 01-05-2011, 11:51 AM
Mohawk Mohawk is offline
Join Date: Oct 25, 2005
Location: Phoenix, AZ
Posts: 89
Heater (blower fan) upgrade

With the rapid approach of winter, it became clear pretty quickly that the heater in my recently acquired J10 left something to be desired. It was noisy and just plain didn't move much air.
My search for a replacement at the local parts houses either came up empty or were, I thought, too expensive.
Since I'm also a CJ guy, I got to thinking (don't worry. I'm ok), maybe the same upgrade that works for the CJ guys might work for the FSJ.
I picked up a blower motor at AutismZone for a '78 Chevy pickup. Part# PM102. $20 with a lifetime warranty. I would have picked up the squirrel cage too but it was unavailable.
Comparing the two motors, side by side, I decided this just might work.

The original motor has a ground wire attached. The Chevy part grounds through the body. No big deal. The squirrel cage from the J10 was held on to the motor shaft with a tiny, pain in the butt clamp that I promptly shot across the driveway, never to be seen again. Oops. No big deal. The Chevy motor uses a nut to retain the cage.
The biggest difference now became apparent. The J10 cage on the Chevy motor extended quite a bit more, into the blower duct. Perhaps with a Chevy squirrel cage, this might not be a problem... I don't know. I may look into that at a later date.

With the blower motor removed, I made a template and cut a spacer from a plastic, 3/8" thick cutting board (as in kitchen) that I picked up at the grocery store for $5.

A word of advice, if you try this mod. Don't use a jig saw to cut the plastic. It will just melt the plastic and make a mess, even on the lowest speed. I used a coping saw. I also had to drill new holes in the blower motor mounting flange to match the holes in my fan duct. You can probably drill new holes in the duct to accomplish the same thing. As a matter of fact, I may have saved myself some headaches if I had done just that.

The original wire that plugged to the original motor plugs right onto the new motor. Beautiful. I clipped the ground wire off of the old motor, crimped on an eyelet, and grounded from a mounting screw to the original ground point. Now, for the moment of truth...

It not only works but works better than I expected. Even with the massive air leaks my J truck has and sub zero temperatures, during my 70 mile/day round trip commute, the cab is toasty warm and I have one less source of noise in the old beast. I have no doubt that once I seal up the cab with new weather stripping and plug unnecessary holes in the firewall, that I'll be able to roast turkeys on the passenger seat.
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Old 01-05-2011, 12:19 PM
Heavy_Metal_Thunder_81's Avatar
Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
Cherokee Outlaw
Join Date: Jan 10, 2006
Location: Oak Harbor, WA
Posts: 7,287
-Jonny B.
1979 Cherokee Golden Eagle - UNDER CONSTRUCTION
7" Alcan springs, BJ's HD shackles - 35x12.5x15 BFG Mud Terrains
AMC 401 - Pro-Flo 4 EFI
NV4500/NWF BB/NP205 - Triple Stick'd
F D44 - 4.10, Eaton E-Locker
R M23 - 4.10, Detroit Locker

1979 Cherokee Chief - Parts
1979 Cherokee Chief - Parts
1979 Wagoneer - Sold
1981 Cherokee Chief - Cubed
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Old 01-05-2011, 08:26 PM
cself cself is offline
232 I6
Join Date: Jan 13, 2008
Location: Atlanta
Posts: 68
Okay....I'm thick in the head. What was the purpose of the cutting board? I know you said it was a spacer, but why do you need the spacer? Great mod in my opinion as I've been wondering what I could do to increase the fan speed for both a/c and heat. For the cost this seems like a great way to go.
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Old 01-06-2011, 09:14 AM
Mohawk Mohawk is offline
Join Date: Oct 25, 2005
Location: Phoenix, AZ
Posts: 89
The AMC fan on the Chevy motor extended too far into the blower duct. It's possible that the spacer may not be needed if the Chey fan is used. I still need to look into that.
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Old 01-06-2011, 02:49 PM
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Gambler68 Gambler68 is offline
Rabble Rouser
Join Date: Feb 29, 2004
Location: Ignacio, Colorado, USA
Posts: 14,081
Nice! I think even a wood (not mdf) would work fine as a spacer, just seal it. Nice mod, I may try that next winter.
1979 Chero S "Sundog" 1979 Chero S "Hammer"
1968 327 J3000 1978 J10SWB
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
Hunter S. Thompson .

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Old 01-06-2011, 02:55 PM
3rdelement's Avatar
3rdelement 3rdelement is offline
350 Buick
Join Date: Nov 25, 2009
Location: Castle Rock, Colorado
Posts: 1,119
wow. thats ingenious. great idea!
Richard Ricketts
build thread: click HERE
1985 Jeep Grand Wagoneer {woodless}-Edelbrock 1406 carb, Edelbrock Sp2p Intake, Hella ecode headlights, bixenon HID 5000k headlights, mb quart 6.5" component speakers f&r, alpine cde-100 deck, final edition grill, Hella 550 fog lights, 1991 window regulators, cs144, aluminum coolant&washer tanks
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Old 01-06-2011, 09:18 PM
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KyooMac KyooMac is offline
Grease Monkey
Join Date: Oct 26, 2006
Location: Chicago land area
Posts: 464
Nice hack! Were you in the service? Or just a long time Jeep fan?
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Old 01-07-2011, 03:23 PM
Mohawk Mohawk is offline
Join Date: Oct 25, 2005
Location: Phoenix, AZ
Posts: 89
I also have a '77 CJ5 and this is definitely not my first Jeep. If you can't find what you want/need, modify/make it!
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Old 01-07-2011, 09:00 PM
jaber's Avatar
jaber jaber is offline
Dragin Az
Join Date: Oct 17, 2003
Location: Chino Valley, Arizona
Posts: 8,094
Nice mod.

I do have to say, when the heater in these things work, they really cook.

43 cj2a

51 Willys p/u
'51 Willys Parkway Conversion
'74 CJ5
'75 J-20 Wrecker
'75 J-20 Cummins service bed
'77 J-10 p/u
'79 Cherokee
'88 Grand Wagoneer
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Old 01-07-2011, 09:56 PM
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grand_wag_85 grand_wag_85 is offline
Murphy's Law Poster Child
Join Date: Dec 03, 2003
Posts: 10,713
I will be doing this mod on my J truck!
You know it's bad when your car's on the EPA's 10 most wanted list!

'82 J10
'88 GW
'77 J10 Golden Eagle 401

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