Heater Upgrade - JeepForum.com

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post #1 of 45 Old 12-14-2007, 10:05 PM Thread Starter
NWA_CJ7
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Heater Upgrade

How big of a difference is the chevy blower motor going to make. Getting ready to do this mod. I also went ahead and picked up a new heater core today, figured it cant hurt to change the one that is in there. Also, do i need to change the squirrel cage wheel or reuse the stock one.

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post #2 of 45 Old 12-14-2007, 10:31 PM
slacker92104
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The difference is huge. Make sure you get the pm102 from autozone. Re-use your squirrel cage wheel. It will bolt right up.

'81 CJ5, efi 302, AX-15 5 spd, On Board Air, wrangler spring conversion, Astro van Hydro Brakes.
Soon: Custom cut Dana 44 front, wide trac solid axle amc 20 rear, SOA,
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post #3 of 45 Old 12-14-2007, 10:48 PM
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Not to hijack, but i'm thinking about doing the same, my heater does ok for stock, but i get almost no air out of the defrost....Is this the best way to get more defrost?

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #4 of 45 Old 12-15-2007, 04:21 AM
solitudetree
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The chevy blower motor upgrade will make a very big difference in both the heat and defrost of the Jeep. Make sure you get the short shaft PM102 and you can reuse the original squirrel cage with no problem.

Doing the heater core is an excellent idea since you're going to be pulling the heater core anyway to enlarge the hole in the firewall.

Test fit the blower motor to the hole before you start putting anything together. I didn't do that and it was a pain.

Also, check your duct hose from the heater unit to the defrost vents. If it's original, it could have holes or not be hooked up correctly. I replaced mine with one from 4WD and it made a difference in the amount of air coming out of the vents.

Also, label your cables before you do this so you remember which one goes where.

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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post #5 of 45 Old 12-15-2007, 05:48 AM
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post #6 of 45 Old 12-15-2007, 05:49 AM
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Search the YJ section and you will see your answer. It is a TREMENDOUS difference. Several people I know went from "OK" heat to "HOLY **** THAT'S HOT" heat.


-Rusty


Congenital Heart Disease is a reality for me, BOTH of my children have it. Please read up and become aware for future generations

Lydia Ann-Acquired 08/05/05 Open Heart surgery 08/10/05
Jacob Patrick-Acquired 01/17/08 Open Heart surgery 02/15/08
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post #7 of 45 Old 12-15-2007, 11:41 AM Thread Starter
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So this is getting confusing because most of you guys are saying to use a PM102 motor and the article on jeeptech.com regarding the heater upgrade calls for a PM105 (which fits a 73 chevy blazer 350) I have no idea what the PM102 Fits. So which one do I need to get.
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post #8 of 45 Old 12-15-2007, 12:20 PM
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Quote:
Originally Posted by NWA_CJ7
So this is getting confusing because most of you guys are saying to use a PM102 motor and the article on jeeptech.com regarding the heater upgrade calls for a PM105 (which fits a 73 chevy blazer 350) I have no idea what the PM102 Fits. So which one do I need to get.
http://www.partsamerica.com/ProductD...rtnumber=35587
This is the one that I used and it works perfect. Very easy install.
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post #9 of 45 Old 12-15-2007, 06:11 PM
wswartzwel
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I just did mine yesterday... WOW!! what a difference. I got a heater motor for a 73 V8 blazer, with A/C from O'reillys... Less than $20... also replaced the heater core. Took about 3 hours I did not remove the dash,but I have Factory Airconditioning, and had to drop it down out of the way.
I used this link.
http://jeep.off-road.com/jeep/articl....jsp?id=261421
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post #10 of 45 Old 12-15-2007, 07:48 PM
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Quote:
Originally Posted by NWA_CJ7
So this is getting confusing because most of you guys are saying to use a PM102 motor and the article on jeeptech.com regarding the heater upgrade calls for a PM105 (which fits a 73 chevy blazer 350) I have no idea what the PM102 Fits. So which one do I need to get.
The pm105 has a longer shaft and will require shortening to use the stock squirrel cage. The pm102 will bolt in directly with no mods (except for the larger hole in the firewall) I just did this swap a month or so ago, so it's still fresh in my mind.

'81 CJ5, efi 302, AX-15 5 spd, On Board Air, wrangler spring conversion, Astro van Hydro Brakes.
Soon: Custom cut Dana 44 front, wide trac solid axle amc 20 rear, SOA,
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post #11 of 45 Old 12-15-2007, 08:30 PM Thread Starter
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Just finished redoing the box installed new pm102 and new heater core. Box was pretty rough so I shot it with some semi flat black spray paint just letting it dry overnight, it looks brand new now. I'm going to reinstall tomorrow morning and will post my results. Thanks for all the help. Was actually a pretty simple mod. Will probably have about 3 hrs total in it.
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post #12 of 45 Old 12-16-2007, 04:56 PM Thread Starter
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Well got everything put back this morning and it ran pretty good, could at least feel heat for once however it wasn't just overwhelming but that could be because i only have a bikini top with a windjammer, I figure once i find some full soft doors i should be good.
Also how long till i can post some damn pics. This site is ridiculous. I'm a member of at least 7 forum sites and this is the only one i cant post pics on.
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post #13 of 45 Old 12-16-2007, 06:19 PM
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Quote:
Originally Posted by NWA_CJ7
Also how long till i can post some damn pics. This site is ridiculous. I'm a member of at least 7 forum sites and this is the only one i cant post pics on.

50 tech posts and 30days membership. Ridiculous, I do not think so. This site is large enough that it attracts spammers like the plage. It is simply a safety net and trust me, I belong to some sites that do not have such a feature and it is constantly hit with crap, spam, porn etc. Once you hit 50 posts you will be all set.

-Rusty


Congenital Heart Disease is a reality for me, BOTH of my children have it. Please read up and become aware for future generations

Lydia Ann-Acquired 08/05/05 Open Heart surgery 08/10/05
Jacob Patrick-Acquired 01/17/08 Open Heart surgery 02/15/08
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post #14 of 45 Old 12-17-2007, 04:51 AM
solitudetree
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I have the same setup on mine. Bikini top, windbreaker curtain and doors. I don't have a problem with the heat. I seldom have to set it on high. Most of the time medium is good enough.

4WD sells a plastic slide on directional vent for the bottom of the heater assembly. It redirects the air towards the driver's and passenger's feet (with most of the airflow going towards the driver) instead of the air just coming out and going down the middle.

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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post #15 of 45 Old 12-17-2007, 07:21 PM
b.d.d.
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Just got my motor and new heater core. Going to install Sat or Sun. Can't wait because I had to tear the pass seat out and install a fire pit to stay warm. If anyone wants instructions on how to vent a chimney flu out the rear window, email me

83 CJ8
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