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Unread 02-18-2007, 07:30 PM   #1
napoleoneight
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Heater Blower motor upgrade

i remember reading a while back about a heater upgrade that invloves swapping out the blower motor for one out of a 70's blazer. anyone have any experience with this mod?

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Unread 02-18-2007, 07:35 PM   #2
Rollbar
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Go here:

http://jeep.off-road.com/jeep/articl...otor%20upgrade
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Unread 02-18-2007, 08:21 PM   #3
Shameless Elmer
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I did my blower motor upgrade as part of a frame-off job. I drove it for the first time in +2 years yesterday. As I was cleaning up today I came across the old blower motor and the box the new one came in.
I installed a Siemens blower motor. The Siemens part number is PM102. The NAPA part number for the Siemens motor is 455-1039.
It cost me $23.00 for the new motor.
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Unread 02-18-2007, 09:04 PM   #4
Cannonball
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I did mine too and used one from a '76 blazer with air conditioning. the blower fan was about twice as wide so it moves a lot more air. As long as I had the box out i decided that i never wanter to have to remove the unit to replace a blower motor again so i traced a larger hole on the firewall to allow the blower to pass completely through the fire wall. Used some thigk foam insualtion and duct seal to seal the gap between the firewall and heater box upon reinstallation. Now i can unscrew the motor and replace it from the engine compartment with out having to take the heater box out. So far it has lasted 10 years but If i ever need to take it out it will be easier...........

Cannonball
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Unread 02-19-2007, 05:57 AM   #5
jeepmor
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How much improvement fellas. I might have the head off my jeep soon and figure this would be a good one to do while access is somewhat easier.

regards,
jeepmor
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Unread 02-19-2007, 06:19 AM   #6
schmoken
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MAJOR improvement.
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Unread 02-19-2007, 07:41 AM   #7
Cannonball
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well i went wheeling 3 weeks ago when it was -12 with only a soft top! The windshield even stayed clear with the defrost only 1/2 open

Major!

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Unread 02-19-2007, 10:05 AM   #8
Bromius76
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The write up above says it should work for 76-86 cj's, but not some 77's. I have a 1976 CJ7, will this upgrade work for me? It says that if the blower is sticking through the firewall it should. But what am I looking for? Still new to this, so I'm not exactly certain. Does anyone have some photos as examples?

Thanks!!!!
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Unread 02-19-2007, 04:22 PM   #9
solitudetree
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Napoleon,

The chevy blower motor upgrade rocks. I did it on mine over a year and a half ago and it makes a huge difference on the amount of heat and defrost return that you get.

Here are links for writeups with pictures so you, Bromius 76 and others know what to look for.

http://www.jeeptech.com/body/heater.html

http://www.manoian.net/jeep/blower_fan.html

http://www.sierrajeep.com/heater.htm

These should help. I did a write up to include bolt sizes and pictures but my computer played pacman with it.

If you have questions, let me know.
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[COLOR=DarkGreen][FONT=Century Gothic]All the Jeeps I've owned
79 CJ5 258 six with a weber (current vehicle) T18/Dana20
81 CJ5 258 six (driven out of Alaska thru Canada in winter with a softtop)
75 Jeep Wagoneer 360V8
79 Jeep Cherokee 258 six
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Unread 02-19-2007, 06:28 PM   #10
Bromius76
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Tx, Solitudetree. I don't remember seeing anything under my battery tray at that spot. I assume this means I have the "alternate" style heater and so no upgrade? Or would it be possible if I just tear more parts out from a U-Pull and cut a hole in the firewall?

Ah yes... my computer has eaten many a document.. Wacka wacka wacka..
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Unread 02-20-2007, 02:29 PM   #11
napoleoneight
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now im one of the write ups you posted i noticed washers stacked between the motor and the housing to align the "hamster cage" fan correctly, is this common to this swap regardless, or was the motor in that write up a special case?
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Unread 02-25-2007, 12:44 PM   #12
only in a jeep cj
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He mistakenly used a PM 105 with the longer shaft. ...instead of the PM102 motor
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Unread 02-25-2007, 02:17 PM   #13
smokencj7
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i did the upgrade to my 84 cj and used a motor from a 80 blazer with a 350 eng. works real good you have to cut the hole in the firwall bigger and do a littel mod to the box and that was it
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Unread 02-25-2007, 05:01 PM   #14
napoleoneight
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the heater motor i have now doesnt work, im not sure if its the motor of something else in the wiring, is that little resistor setup for the fan speed control prone to failure? or is it likely the factory terminal, the one thats directly in the line of fire from my passenger front tire maybe? anyone experienced this?
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Unread 02-27-2007, 04:51 AM   #15
solitudetree
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Your switch could be bad or there's a short somewhere. The blower motor is a metal to metal ground if I remember correctly.
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[COLOR=DarkGreen][FONT=Century Gothic]All the Jeeps I've owned
79 CJ5 258 six with a weber (current vehicle) T18/Dana20
81 CJ5 258 six (driven out of Alaska thru Canada in winter with a softtop)
75 Jeep Wagoneer 360V8
79 Jeep Cherokee 258 six
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