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Unread 12-14-2007, 11:05 PM   #1
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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Unread 12-14-2007, 11:31 PM   #2
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.
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Unread 12-14-2007, 11:48 PM   #3
jp360cj
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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?
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Unread 12-15-2007, 05:21 AM   #4
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.
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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
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75 Jeep Wagoneer 360V8
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Unread 12-15-2007, 06:48 AM   #5
MuddyMules
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http://www.jeepforum.com/forum/f8/chevy-heater-blower-motor-293665/
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1984 CJ7 Renegade - 258 4.2L, 5 Speed, 2" BDS YJ Springs with BDS CJ Conversion Kit, Weber 34 DGEC Carburetor, Aluminum Valve Cover, 73 Chevy Blower Motor, Bestop Supertop, Pro Comp XTreme Alloy 1079 Wheels, 33" x 12.5" x 15" BF Goodrich AT KO Tires, Holley Fuel Pressure Regulator and Gauge, Flowmaster 40 Series with Universal Catalytic Converter and 2 1/2" Pipe and still going.....

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Unread 12-15-2007, 06:49 AM   #6
rustywrangler
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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
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Unread 12-15-2007, 12:41 PM   #7
NWA_CJ7
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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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Unread 12-15-2007, 01:20 PM   #8
MuddyMules
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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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1984 CJ7 Renegade - 258 4.2L, 5 Speed, 2" BDS YJ Springs with BDS CJ Conversion Kit, Weber 34 DGEC Carburetor, Aluminum Valve Cover, 73 Chevy Blower Motor, Bestop Supertop, Pro Comp XTreme Alloy 1079 Wheels, 33" x 12.5" x 15" BF Goodrich AT KO Tires, Holley Fuel Pressure Regulator and Gauge, Flowmaster 40 Series with Universal Catalytic Converter and 2 1/2" Pipe and still going.....

[url]http://www.jeepforum.com/wiki/index.php/1984[/url]

[B]There is a $10,000.00 CASH REWARD for anyone with information leading to the arrest and conviction of the person(s) that killed my cousin Blake Dickus and his stepmother Chynna Dickus on July 24th, 2006. Please contact the Franklin, Indiana Police Department at [url]http://www.franklin-in.gov/police/[/url] or contact America's Most Wanted at [url]http://www.amw.com/fugitives/case.cfm?id=51938[/url][/B]
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Unread 12-15-2007, 07:11 PM   #9
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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Unread 12-15-2007, 08:48 PM   #10
slacker92104
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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.
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Unread 12-15-2007, 09:30 PM   #11
NWA_CJ7
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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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Unread 12-16-2007, 05:56 PM   #12
NWA_CJ7
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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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Unread 12-16-2007, 07:19 PM   #13
rustywrangler
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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
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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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Unread 12-17-2007, 05:51 AM   #14
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.
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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 12-17-2007, 08:21 PM   #15
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
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