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Unread 12-17-2007, 02:35 PM   #1
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Join Date: Nov 2007
Location: Hurricane, Wv
Posts: 23

Ok I have read the forums as I hate to ask repetitive questions and I have found many people have upgraded the heater and defroster in there Jeep BUT they have the 4.0 engine.

I have a 2.5 stock and the heater puts out very little heat and hardly blows. Has anyone upgraded there stock 2.5 and can give me a few options? Much appreciated.


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Unread 12-17-2007, 02:36 PM   #2
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1990 YJ Wrangler 
Join Date: Mar 2006
Location: Macomb, Illinois
Posts: 1,329
I thought all that stuff was the same no mater what engine you have, am I wrong in thinking this?
1990 YJ, Colorado Red with 'Laredo' markings, 4.2L, TF999, NP231, Valvoline Syn fluids, Weber 32/36, Nutter Bypass, Dana 30/35, 16" Electric Fan, Optima Yellow Top, 140amp alt., K&N Air Filter, Cherry Bomb muffler, SRC Front Bumper, CH&F Shackles, KC 100w Daylighters, Homemade Lightbar, Rear Aux lights, Cobra CB/PA/WX, 102" Whip Ant., 400 watt power inverter, 2 fire extinguishers, Mobile Internet & WiFi equipped.
Daily Driver since April 23rd, 2003

Northern Illinois Extreme Jeep Club Member www.extremejeepclub.com
Weber 32/36 Install -> http://www.jeepforum.com/forum/f12/weber-32-36-install-write-up-382309/
Early YJ Club Member #37
For anyone with a 4.2L --> http://groups.jeepforum.com/258s_Unite
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Unread 12-17-2007, 02:48 PM   #3
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1989 YJ Wrangler 
Join Date: Dec 2004
Location: Frederick, MD
Posts: 1,705
Flush or replace the heater core, check or replace the thermostat, make sure the actuator cables are hooked up. One of those will make you sweat!
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Unread 12-18-2007, 01:35 PM   #4
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2000 XJ Cherokee 
Join Date: Dec 2007
Location: Idaho Falls, ID
Posts: 173
i have a 2.5l and the blazer heater motor works great. I just upgraded it about a week ago. what a difference. just go get part number pm102 at AutoZone and switch it out. if you search "heater upgrades" you will find step by step on how to do it.
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Unread 12-18-2007, 02:46 PM   #5
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1985 CJ7 
Join Date: Aug 2006
Location: Mokena, IL
Posts: 1,146
I have to turn the blower down to the half setting after the water temp hits 180 because it gets too hot

As far as I know, mine's stock.

Cowl vent clogged? I pulled a ton of leaves out of mine before winter.

Also, thought this was somewhat relevant here, might build them:

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Unread 12-18-2007, 03:04 PM   #6
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1961 CJ5 
Join Date: Oct 2007
Location: Maspeth N.Y
Posts: 508
My Jeeps like a nice and toasty until I get on the highway.
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