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Unread 09-02-2003, 11:15 AM   #1
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Join Date: Mar 2002
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XJ Heater Core Replacement

Hello all. I am having a problem with my 1993 XJ where steam is constantly coming out of my windshield defroster ducts which leads me to believe that my heater core is slightly leaking. Has anyone here replaced their own heater core. How difficult is it? Can someone give me a quick write-up on how to do it or give me some tips? Thanks!

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Unread 09-02-2003, 01:39 PM   #2
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You say 'steam'. Does it smell very strongly of antifreeze?

I had an Audi with a cracked/leaking heater core, and let me tell you, steaming antifreeze nearly made me throw up. If it doesn't smell like that, then it isn't the heater core.
94 XJ, 4.0/AW4/8.25/242. 145k miles, bought it in march of '02. Rusty's towhook on front, Hidden Hitch out back with shackle. Rebuilt AW4 in January, '03. Kumho MT's on AR767.
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Unread 09-02-2003, 11:09 PM   #3
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Check your blower motor. Could be the solution to your "steam"
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Unread 09-10-2003, 09:26 PM   #4
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Exclamation Good luck...

More than likely it is your heater core that is leaking. What happens is when your thermostat opens, it sends the warm water to the heater core and causes a rush of steam. And no offense, but if you aren't even sure that it is the heater core, it's going to be a tough job....I just changed my heater core in my '86 Cherokee this past sunday. What i thought to be a rather minor project took me all day to do. The plastic box that encases the blower motor, the a/c condensor, and the heater core is located under the passenger side of the dash, and I do mean UNDER the dash! It goes from about the ashtray all the way to the passenger side door. There are five bolts that hold this unit in place which are located in the engine compartment on the firewall.(A few of them are in real dandy spots) All of the bolts have to be removed and the entire unit has to be taken out. It is by no means a fun or easy task...If perchance I ever have to change it again, I am selling the damn thing!!! If you do decide to tackle this project and you have any further questions, feel free to give me a yell and I will help out in any way I can.
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