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Thread: 00 XJ Heater Core Replacement.

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    00 XJ Heater Core Replacement.

    well here I am, new heater core in hand and seeing what I have ahead of me. my question is, if there is a way around ripping the dash out? it has been flushed twice already and still not working after 2 days. I say " I might as well buy a new core" HA! for some reason i thought that this was going to be a good easy job. I'm thinking other wise. Any suggestions? help? anything but mocking and making me feel worse please HAHA!

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    Stickybongsmoking is offline Yes, this is gawd damn muthafockling CTD NUT.
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    Welcome to JK. Have you checked return flow out of the core with the engine running? If the flow is acceptable and you have no heat, you may have a blend door issue and not a heater core issue. If the flow is poor, then yes, flushing didn't work and the core is plugged up. Unfortunately, whether there is a blend door issue or a heater core issue, the end result is the same, the HVAC unit has to be disassembled to fix either problem.
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    The dash needs to be lifted to remove the ac/heater box. If your ac works or still has gas, you need to take it to a shop to have the Freon vacd out. It's not that hard to change, I did mine in April. It just takes time. You only need to drop the steering column, not remove it. You also don't need to disconnect the wires. I only removed the front passenger seat. You can pm me your number if you want me to guide you through it.
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    Thanks! My AC is all brand new and works like a champ, so I know it isn't the blend gate. Good coolant flow also, I am going to give it another good flush for good measure before I replace it. I always knew having a mechanic buddy was a good life choice haha. If it was just me I would leave it, but I have a 1 year old son so it has to be working!!!

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    You can try draino.
    Disconnect both heater hoses from the engine, bypassing the heater core. Then connect hoses to the heater core and with a small funnel fill it up. You might want to dilute the draino with water, and don't get any splashed in your eyes. After letting it sit for a while, flush with lots of water and maybe with baking soda in it to nutralize the acid. I'm guessing the po had a cracked head and tried sealing it with the stupid stop leak stuff. I've never tried this, but I know of lots of people that have. Look into it before you try it, in case I'm missing something.

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    well i flushed it another 2 times and then changed the thermostat even tho my "Mechanic/friend" said it was that. I WAS RIGHT! haha its working great for now, we will see what the week will do for it. I still have the core sitting in the box for the last resort!!

    thanks for all your help guys!

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