how do u bypass heater core?


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Old 11-21-2008, 10:05 PM   #1
muddeprived
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Default how do u bypass heater core?

anyone done this? i need to bypass mine cuz its leaking and killing me, even with the heater off. someone explained how to bypass it but wasnt clear and im not sure where the heater core hose is.

any help appreciated.


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Old 11-21-2008, 10:34 PM   #2
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since I dont use heater here in PR, well I just took the hose out, and put in a nipple hose,, just to cover that exit and thats it.. and the same on the AC part,, I dont want nothing getting there,, thats about it..
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Old 11-21-2008, 11:28 PM   #3
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Take a look at your pass side firewall. You'll see two 3/4" hoses running into the firewall, these are your inlet and return to the heater core. Follow back to the thermostat housing, take that hose and loop it back.

If this doesnt help i'll try to snap a pic for you in am.
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Old 11-22-2008, 12:40 AM   #4
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Originally Posted by OverlandXJ View Post
Take a look at your pass side firewall. You'll see two 3/4" hoses running into the firewall, these are your inlet and return to the heater core. Follow back to the thermostat housing, take that hose and loop it back.

If this doesnt help i'll try to snap a pic for you in am.
That should do it. I just needed to know where the hoses were and that helped. Thanks! belto too.
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Old 11-22-2008, 06:19 AM   #5
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hose from the water pump to the T stat housing.
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Old 11-22-2008, 11:53 AM   #6
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Alright i found the hoses. They are running along the top of the engine into the passenger firewall. One is 5/8 and one is 11/16. Since both are different thicknesses, how do i go about bypassing them? Is there a 11/16 / 5/8 hose adapter out there?


Also, is there a way to drain the heater core? I don't want to leave the coolant in there if it's leaking.
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Old 11-22-2008, 01:41 PM   #7
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Just loop the larger one and clamp that ***** down.
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Old 11-22-2008, 01:46 PM   #8
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This question is year specific. If you just loop the tstat housing back to the water pump one on a closed system, you will have major problems. Open one, sure.

There's a nipple-nipple adapter out there that will work fine. They make them to do lots of weird things. Just hit up a decent hardware store, or sometimes auto-parts stores have 'em.

And to drain the heater core, you have a couple of options. With the hoses off it, flip the jeep onto the passenger side. If this doesn't sound ideal, pull the HVAC housing apart (it's held together with a bunch of screws), and pull the core out. At which point I'd recommend throwing a new one in, but that's up to you...
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Old 11-22-2008, 06:59 PM   #9
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Originally Posted by 2drx4 View Post
This question is year specific. If you just loop the tstat housing back to the water pump one on a closed system, you will have major problems. Open one, sure.

There's a nipple-nipple adapter out there that will work fine. They make them to do lots of weird things. Just hit up a decent hardware store, or sometimes auto-parts stores have 'em.

And to drain the heater core, you have a couple of options. With the hoses off it, flip the jeep onto the passenger side. If this doesn't sound ideal, pull the HVAC housing apart (it's held together with a bunch of screws), and pull the core out. At which point I'd recommend throwing a new one in, but that's up to you...
I believe i have the open system correct?

Pull the heater core out? I thought you have to remove the entire dash to get to it?
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Old 11-22-2008, 07:57 PM   #10
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Cut your inlet hose off an stick a bolt in it and clamp it down is the redneck way they also sell a heater hose block off cap at most parts houses.
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Old 11-22-2008, 08:51 PM   #11
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Quote:
Keep in mind if you get into wheeling at all you are not going to want to worry about scratching the paint job.
jeepride

Hey not just the redneck way the right way!
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Old 11-23-2008, 06:10 AM   #12
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Quote:
Originally Posted by ZackXJ View Post
jeepride

Hey not just the redneck way the right way!
where's that quote from? i'm lost.

Quote:
Keep in mind if you get into wheeling at all you are not going to want to worry about scratching the paint job.
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Old 11-23-2008, 09:31 PM   #13
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Quote:
Originally Posted by jeepride View Post
Cut your inlet hose off an stick a bolt in it and clamp it down is the redneck way they also sell a heater hose block off cap at most parts houses.
that one^^^ I guess (no offense jeepride just answering the Q)

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where's that quote from? i'm lost.


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