Question about 2001 Jeep Wrangler

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I need to know how to bypass a heater core to a 01 jeep wrangler, till I can replace the heater core

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Bypass is simple. Remove both hoses at the firewall where they connect to the heater core. Install a four inch piece of half inch copper pipe between the hoses and use screw type clamps to tighten it up.
If you don't let the hoses drop down while you are working you won't loose much coolant (probably about a cup or so) but check level anyhow after running it for a few minutes.

Posted on Mar 24, 2011


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My 1999 jeep wrangler is over heating, smoking and losing coolant , I replace the heater core, replace radiator, replace thermostat and thermostat housing still over heating

It appears that you have a blown headgasket, a failing water pump, or a cracked block.

There is also the possibility of a freeze plug failing & leaking there.

You can bypass the heater core until you are sure your engine problems are corrected so as not to damage it from excessive pressure.

You'll need to reassemble everything and pressure test the system instead of starting the engine, to see where the leaks are.

Good luck !

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There is a lot to it! Too much to post here. Email me at hydro83282 at

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Hi and welcome to FixYa!

It may take 2hours the most to replace the heater core.

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How do I replace a heater core on a 1998 jeep wrangler

If there is a thermostat installed in the engine (195f) and the engine comes up to temp (about 210f) then the problem is likely either an internally blocked core or a bad blend door inside the box. I'd flush the core first by putting flush directly into the core with both hoses disconnected from engine ends.Likely you have a control valve on one of the heater hoses as well they can stick but for most, failure "default" position is to the heat side. Keep the hoses above the core and fill through one end till it comes out the other hose. Wait about a half hour then drain and flush with a garden hose in both directions. If blend door vacuum motor is malfunctioning or door is stuck inside box that is not fun to do. You will need a manual for instructions (haynes or chilton are OK for that) and you need to set aside an entire day for the project.Manual is good for many other projects and so is not a bad thing to have.(about $20)
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I have a 1993 Jeep Wrangler YJ...My heater core needed replacement when I bought it about a year ago. I made the mistake of taking apart the dash to get to the heater core. DO NOT DO THIS!!! It is actually 4 screws that you must take out from the inside of the engine compartment on the firewall. Then it will come right out. Have fun!!!

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1 Answer

I need to change the Heater core, Please help me. Thank You

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