LS3 water pump heater out and inlets - needed?

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Nov 4, 2011 | 06:37 AM

corvettedave

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LS3 water pump heater out and inlets - needed?

Ive got a new LS3 for racing offroad 4x4 car, dont need heater in it, what can I do with the waterpump in/out for heater, someone said they should be pumped into a heater, if you dont that can affect engine cooling, etc

thoughts please?

dave

Nov 4, 2011 | 07:53 PM

S10xGN

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You'll get mixed opinions. Most say blocking them causes bypassing the radiator. I have mine going to a heater core, but the valve for the heater is a "positive seal" block valve, so what's the difference? I have no issues at all...

Nov 4, 2011 | 08:08 PM

DietCoke

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Pumping them into a heater does nothing. You can remove them, or loop them.

Nov 5, 2011 | 04:05 AM

rsz288

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Thermostat operation does wierd things if they are blocked. Looped and the tstat and cooling system operates normally. If they are blocked then the tstat sits in a "cold" spot of static water which causes late opening of the thermostat at low speeds with excessive heating and then excessive cooling at higher speeds. This is with a factory stat at least.

This is why the factory setup has water flowing between them at all times with a bypass type heater control valve.

Nov 5, 2011 | 06:57 PM

corvettedave

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Thanks for help guys

is it ok to use a 4 inch piece of rubber hose or does it need to be longer?, I wouldnt of thought it would make any difference?

cheers

dave

Nov 5, 2011 | 07:45 PM

rsz288

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Quote:

Originally Posted by corvettedave

Thanks for help guys

is it ok to use a 4 inch piece of rubber hose or does it need to be longer?, I wouldnt of thought it would make any difference?

cheers

dave

As long as water flows through it, it doesnt care.

Maybe you can find a molded u turn hose that will fit.

Nov 6, 2011 | 06:48 AM

garys 68

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I'm running mine with a heater control valve which effectively blocks it. No problems. In modern cars, there is always flow through it though. Also marine versions loop the inlet/outlet, so I do believe it works better with flow through it all the time.
If you search the conversions forum, there's a part number for a loop hose.