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Old 05-27-2003, 08:23 PM
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Post Jumping the heater core hose...is it ok

I recently checked my heater core and there was a lot of crud coming from the heater core hoses so I just jumped the hose from the water pump to the manifold. Is this ok to do? I'm too lazy and don't have the money to put a new heater core in after getting my tranny rebuilt and installed again. I was just wondering if this is a problem for cooling

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Old 05-27-2003, 08:25 PM
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It should be no problem, if anything your coolant will flow better, but if your start to overheat you cannot use your heater to try and cool it down
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Old 05-28-2003, 03:41 AM
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You didn't say the year,but a lot of later vehicles (because of the higher temps) use the heater core as part of the cooling system and could make it run hot. Another thing that can happen is with the core open and not circulating it can deteriorate to the point that when you reconnect it you'll have a leaker.
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Old 05-28-2003, 06:31 PM
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Its easy to get crud in the system if your coolant ratio is a bit lean. You get these jelly looking things. Try getting one of those cooling system flush kits that splices to the heater hoses and hooks up to your garden hose. Run a bunch of water through your heater core, then try hooking everything up again. It might work.
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Old 05-28-2003, 08:59 PM
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Hey woods, not saying you are wrong but how would a heater really help cool the system when it is not in use? I'm just curious. I understand there is a certain amount of heat it will radiate but If you had the heater selector over to cold, and the fan off wouldn't it be just like bypassing the system?

Then again you did say newer cars so there could be some sort of system made by some engineer who took too much bad acid back in the day and fried his brain. (all this trash talk and I wanna be an engineer)
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Old 05-28-2003, 09:16 PM
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Just make sure you cap off the core in case you'll want to use it someday. You don't want it collecting junk inside and then have that running through your block when you reconnect.

Regards
Mark
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Old 05-29-2003, 01:55 AM
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Yeah keep the dirt dobbers out. If you're overheating, the heater core acts like a radiator by releasing heat to the air. It just might make the difference between driving & walking.
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Old 06-01-2003, 04:43 PM
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Yeah I jumped it and it's doing fine. I don't plan on using the old core this winter, it looks like it's done for. Thanks y'all. Oh yeah it's an old 350 block out of a 72 pickup
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Old 06-02-2003, 04:00 AM
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SC, the core is a small radiator and as long as coolant is circulating through it will shed heat (radiate if you will). That's why they have doors in the chamber that isolates it from the interior on warmer days. Older cars had shut off valves that kept the coolant from circulating, but that isn't the case anymore. Now ponder this, they also use the A/C to aid in defrosting...why, to help dehumidify .
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