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Unread 01-01-2010, 10:00 AM   #1
Truck633
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heater core hose routing

I searched a few threads in here, and can't seem to find the answer. I have had a bit of a leaky heater core, not bad enough to fix until yesterday!! I have bypassed the intake and run just directly from the thermostat housing and the water pump to the heater core. I don't know the direction of flow in the core, but I know unluess the thermostat opens, I don't get any heat? Do I have the hoses backwards? is there a "backwards"? any help would be ...well warmer!!

Thanks,

Tom

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Unread 01-01-2010, 10:07 AM   #2
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The water pump sucks.. On a 258 with a heated intake, from the thermostat housing to front of intake, back of intake to bottom of heater core. From the top of heater core to water pump If you have your hoses on the heater core the other way around air will be trapped and the heat wont work so well,
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Unread 01-01-2010, 10:09 AM   #3
ccbhunter14
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I've got the water pump hose running to the bottom of the heater core and the thermostat housing hose running to the top of the core and it gets nice and toasty!
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Unread 01-01-2010, 10:14 AM   #4
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Thanks! I have tried both ways, I think I am just gonna remove the thermostat to get some more flow.
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Unread 01-01-2010, 10:20 AM   #5
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Thanks! I have tried both ways, I think I am just gonna remove the thermostat to get some more flow.

Not a good move, ever..

It wont warm up enough/at all in cool weather, in warmer weather in may very well over heat because the water wont stay in the radiator long enough to cool.

I just replaced my thermostat again because I wasn't getting sufficient heat. I didn't bother to test it before I installed the last one but it was opening to far causing the cool running, I tested the new one and the one I removed this time. Opening gap is checked with a thermometer and a feeler gauge over a pot of water on the kitchen stove. I'll look around for the specs if you need them.

Sounds like you need a thorough flush of the system and a tested thermostat installed.
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Unread 01-01-2010, 02:07 PM   #6
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cool, thanks!
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Unread 01-03-2010, 07:54 AM   #7
Mike Romain
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Originally Posted by Truck633 View Post
Thanks! I have tried both ways, I think I am just gonna remove the thermostat to get some more flow.
The thermostat just makes it warm up better, it doesn't affect the flow to the core at all. The core uses a heater 'bypass' hose which bypasses the thermostat.

You also need to be sure that bypass hose from the thermostat runs lower than the level of the coolant in the rad or it will air lock cutting down on the flow and heat radically. Mine were even zip tied to the rad support when I got it and it had zip for heat.

The even sell molded hoses with a 90 deg bend in them for hooking to the waterpump and thermostat housing to keep it low. Here are some part numbers for them:
http://www.jeepforum.com/forum/f8/he...0/#post8272036
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Unread 01-03-2010, 06:17 PM   #8
wrongway92407
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Mine wasn't getting hot, it would blow warm air when you first turned it on, and after a few minutes cold air again. I took the hoses off the heater and blew air through the core and a bunch junk came out, heater works great now. This could be your problem especially if the jeep has been setting for a while. Don't use high pressure and don't stand in front.
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