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Heater hose bypass idea

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Old 04-30-2010, 05:55 PM
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Default Heater hose bypass idea

I've read that the heater hose has to be looped if not used. I'm using a vintage air HVAC unit which closes off the water flow completely when not used, so I'd still need some type of small orifice between the hoses before they get to that valve.

How about drilling an 1/8" hole behind the thermostat for that constant bypass effect. (Through the divider between the flow paths that lead to / fro the heater.) It would allow a small amount of that flow and there would still be enough of a pressure differential to push fluid through the heater core when the cursed vintage air water control valve was fully closed.

Any thoughts? This would work well for anybody wanting to eliminate the heater hoses and still allow the car to warm up properly.

Last edited by Nashty; 04-30-2010 at 05:56 PM. Reason: detail
Old 05-01-2010, 01:55 AM
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I use a 4 port heater bypass valve.. it will route the flow back to pump. It is vacuum controlled (but you can also find them cable controlled) and I think they are for GM Trucks and van's. I did a google on "suburban heater valve" and found many hits.. here is a sample

http://www.autozone.com/autozone/cat...&parentId=52-0

http://www.autopartsdeal.com/catalog...e+Heater+Valve

But any good parts guy should be able to find something that will work or cross reference something.

Last edited by bczee; 05-01-2010 at 02:08 AM.
Old 05-01-2010, 01:17 PM
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I have Vintage Air on my '33 and I'm using the water shut off that came with it with no problems. It's got about 35,000 miles on it, I pretty much only drive it in the summer and it's never even come close to overheating.
Old 05-01-2010, 01:56 PM
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I've got VA with the valve, no problems. Why would the heater circuit be required?
Where did you read it's needed?
Old 05-01-2010, 04:38 PM
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ive got a va system for my camaro (bought in 01 i think) my water valve worked fine till this year after my ls install. i just put a manual shutoff valve on mine, my water valve is up in the fender and a pita to get to
Old 05-03-2010, 09:33 PM
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I've just heard that it won't warm up properly. Just trying to be proactive.
Old 05-04-2010, 08:49 PM
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Originally Posted by Nashty
How about drilling an 1/8" hole behind the thermostat for that constant bypass effect. (Through the divider between the flow paths that lead to / fro the heater.)
I hope you don't mind that I'm posting this here. I thought this was a cool idea, so I drew it up real quick. It seems like a pretty good alternative for those who don't run a heater and don't want to rely on pressed in fittings or another rubber hose.

Thermostat housing part of WP:


Section showing modification:
Old 05-05-2010, 02:17 PM
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That's the idea but I was just going to go in where the thermostat gets stabbed into place. It'd be one less hole to plug.

BTW, nice rendering. Solidworks?

Last edited by Nashty; 05-05-2010 at 02:18 PM. Reason: nice drawing
Old 05-05-2010, 03:16 PM
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Originally Posted by Nashty
That's the idea but I was just going to go in where the thermostat gets stabbed into place. It'd be one less hole to plug.

BTW, nice rendering. Solidworks?
Good call!

Solidworks, indeed.



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