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Unread 12-05-2008, 12:45 AM   #1
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1981 CJ7 
Join Date: Jul 2006
Location: Los Angeles
Posts: 42
CJ7 heater

My 81 cj7 heater has never really blown hot and hard. Is it a weak heater? I have a good thermostat and would rather have my engine cool than have hot air on me. But I am thinking of totally pulling out the heater and have massive room under there for other things, and put another heater (from the wrecking yard) behind my back seat on my box, just for the winter times.Has anyone else thought of this?

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Unread 12-05-2008, 01:03 AM   #2
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1981 CJ7 
Join Date: Dec 2008
Location: Murphysboro, IL.
Posts: 47
the heater in my 81 cj7 SUX! also... this is what i have been looking at investing in http://www.quadratec.com/products/92060_100.htm
-lifes short drive topless...
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Unread 12-05-2008, 05:41 AM   #3
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1985 CJ7 
Join Date: Jun 2006
Location: Kerrville, Texas
Posts: 1,578
Search the forum for "Heater Blower Motor Upgrade" for many many threads on getting adequate heat into your Jeep which also vastly improves windshield defrosting.
Basically, you swap out the blower motor with one from a blazer. It spins at a faster RPM rate which gets more heat into the Jeep.
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Unread 12-05-2008, 07:16 AM   #4
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 17,541
Whoever invented that poor excuse for a heater must have lived some place really warm.....

The best upgrade you can do is to put a big GM blower motor in there. It literally puts out more on low than the stock one did on high. I can now defrost 'all' my windows at -25C or lower in a snow storm (yes, even that little farting triangle in the center of the windshield) and no longer need snow pants and boots or even gloves to drive it. I can open my coat and have even needed to 'turn it down' now and then up here in The Great White North. It is soo nice.....

Here is a link on doing the blower motor swap. It fits right onto the stock squirrel cage fan, but you have to cut the firewall opening a little bit bigger.

Note: get the cheaper of the two motors or the one with the shorter shaft. The 'premium' motor's shaft is too long.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 12-05-2008, 07:27 AM   #5
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1984 CJ7 
Join Date: Jun 2007
Location: Cobleskill, NY
Posts: 1,031
+1 on the blazer motor upgrade. Night and day difference
Bill H. - 1984 CJ-7
Now with Fiberglass!
My Rebuild thread
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Unread 12-05-2008, 10:01 AM   #6
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1980 CJ7 
Join Date: Nov 2008
Location: North Fort Myers
Posts: 601
heat who needs heat....I also have a larger GM blower but live in SW Fla...Right now I have my skins back on and it will run you out in high..but without the full skins it barley keeps your feet warm....
Neal Trombley
1980 CJ 7

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Unread 12-05-2008, 10:32 AM   #7
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1977 CJ5 
Join Date: Dec 2008
Location: Port Orchard, Wash.
Posts: 89
Wow... Small Jeep-world, isn't it? I'm the "Tim Taylor" that Terry Howe credits at the bottom of his how-to on the Blazer blower motor swap! Back in the Jeep-L days I had heard about this swap so tried it, then wrote some basic instructions. That was like 12 years ago! Then Chris Tucker and Terry did it and took pictures and did a really good job of writing it up.

My heater is out again in mine as I'm dealing with a lot of issues that need dealing with on my CJ. I'm going to crack my heater housing (plenum?) open and check the flaps in there. That might be part of the problem with your heater not working right. Those flaps that direct the air from hot/cold, fresh/recirc, floor/defrost have a rubberized outer edge that can dry out or tear. A friend of mine recently redid one using rubber from an old truck inner tube to freshen up those seals. I may end up doing something like that on my own.

Anyway, bottom line is, since you'd have to have your heater box out to do the Blazer blower motor swap anyway, check those seals.

But I'm telling you, replacing that blower motor makes a HUGE difference! The first time I turned that thing on, it blew old leaves out my defroster vents!
Tim Taylor
'77 CJ-5
'67 M715
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Unread 12-05-2008, 11:18 AM   #8
CJ Chet
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1986 CJ7 
Join Date: Dec 2005
Location: Yorktown, Virginia
Posts: 2,575
What, CJ's have HEATERS ?????
Beer is the answer - it doesn't matter what the question is!

'86 CJ7, 265 CI, DUI, TF999, Borla, Weber, 4" BDS Lift.
'00 TJ Sahara.
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Unread 12-05-2008, 11:58 AM   #9
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1986 CJ7 
Join Date: Dec 2007
Location: Tampa, Fla.
Posts: 398
With my heat knob set, temperature knob pulled out to "max", and blower going full bore, I get only luke warm air. But hey, I'm in Florida, so no big deal!

Last edited by Renegade86; 02-06-2009 at 01:16 AM..
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Unread 12-05-2008, 12:05 PM   #10
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1982 CJ7 
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Location: Central Virginia
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or my most recent favorite since i just had it done..... Windshield gasket pieces that fell through beacuse i had to take my vents off for them to do it..... mmmm smelled great this morning...
1982 CJ-7 2003 4.3 chevy vortec, 4L60E, Clocked Dana 300 35 x 12.5 x 15 KM2 on Cragar 399's. Vanco Brake Booster. Power steering conversion. Warn front and rear bumpers with swing away. Moser 1 piece rears. Rear OX.

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Originally Posted by twoleos617 View Post
To reiterate for the 1,067th time, when towing...
remove rear axle, xfer in N, trans in 5th, remove neg batt cable, key to Run and go??
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Unread 12-09-2008, 12:50 PM   #11
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Location: Bay Area
Posts: 6
When I rebuilt my heater box's they where packed with leaves, dust, spider webs and tons of crap. If you can get to them, defintely worth drilling out the rivets, opening up and rebuilding. Replace all the rubber seals with stuff you can get at HomeDepot. Very easy to Do. I have a brand new blower motor (for upgrade) Im selling if anyone is interested.

My Project and Parts For Sale: 1983 CJ7 - http://ascc.com/cj7discountparts
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Unread 02-05-2009, 10:31 PM   #12
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1984 CJ7 
Join Date: Jan 2009
Location: Olympia WA
Posts: 6
Just finished the blower motor swap. Man what a difference it made. I also changed the heater core wile I had it apart. It actually gets hot now and have to turn it down.
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Unread 04-06-2015, 03:17 PM   #13
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1993 YJ Wrangler 
Join Date: May 2004
Location: Austin, TX
Posts: 283
I know this is an old thread, but why can't '91 and newer wranglers take this mod? If I were to obtain a cj dash, cj style heater duct, and cj windshield, would this fit on a 91-95 YJ? The bodies are the same, or so I thought.
1993 4.0 AX-15
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