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Old 05-01-2011, 04:01 PM   #1
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Heater core bypass help/tips

I have done multiple internet searches on this issue and I think I have a faulty heater/heater core. I have the smoky mist and foggy windows and sweet smell coming out the defroster.

It appears there is an "epoxy" (semi hardened sticky) like substance under the dash on the passenger side so I decided that all these symptoms lead to a faulty heater core.

My problem is before I replace (or get it replaced) how do I bypass it? Specifically where are the tubes to connect together? I cant quite tell which ones. Do I do it from the passenger side inside the cab? or in the engine bay? I guess I am just having trouble locating which tubes are the right tubes. I haven't seen any pictures.

Thanks a lot.

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Old 05-01-2011, 05:06 PM   #2
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The heater core goes to the passenger side on the firewall. There are the two hoses you were referring to that hook into the core that is located at the passenger foot area.

To bypass it, you should be able to simply undo the clamps that go to the core studs and you should be able to use some 1/2" copper 90* fittings sweated together to make a "U" shape to cycle the coolant back through the system and still bypass the core.

If you decide to do the core replacement yourself (I recommend you do, it is not very hard) pull the passenger seat out to make the job a ton easier. Good luck with your project.

Jeff

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Old 05-02-2011, 09:11 AM   #3
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thanks, so its the only two tubes i see in the passenger foot area?
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Old 05-02-2011, 09:52 AM   #4
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but they are on the firewall as in under the hood... and btw renegade your vehicle choices are about as complete opposite as you can get..
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Old 05-02-2011, 02:27 PM   #5
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Shin,
this is why I am confused...turd says remove the passenger seat which means it's easier to work with inside the cab, where as you mention firewall under the hood.

This leaves me scratching my head...where do I make the bypass? In the cab inside? or in the engine?

Btw, yes they are, best of both worlds. I'm not the only one on here who's got that set up either.
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Old 05-02-2011, 02:46 PM   #6
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Heater core bypass.

He said to remove the passenger seat if you are replacing the heater core which is inside the passenger compartment. But if you just want to try bypassing the heater core first to make sure that is the problem, then you do that from inside the engine compartment. Just connect the two hoses heading into/through the firewall.
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Old 05-03-2011, 08:08 AM   #7
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oh, got it...I read too quickly.

thanks a lot!
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Old 05-03-2011, 08:29 AM   #8
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You can buy a straight adapter from the parts store, one should be 5/8" and the other I forget, but I just bypassed the heater core in the TJ about a year ago before I replaced it. Worked perfectly.

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