944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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heater valve

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heater valve Empty heater valve

Post  dallas on Sat Jul 18, 2009 8:27 pm

Hi Guys,
I'm looking for a picture of the installation of the heater valve on the LS conversion of a running car. I found pictures of cars in the build process. The posche valve seems to work backward compared to the 5930 recommended valve. It seems to need vacuum to recirculate to protect the warming engine. and no vacuum to circulate to the heater.Anbody have a provensetup that works with the Porsche heater control? Thanks in advance, Alex[u]

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heater valve Empty Re: heater valve

Post  gt1scca on Sat Jul 18, 2009 10:43 pm

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< $15.00.

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heater valve Empty Re: heater valve

Post  dallas on Sun Jul 19, 2009 6:43 am

Sorry but you lost me on that one. Are you using that to relieve vacuum to start the ciculation through the heater? I'm lost Question

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heater valve Empty Re: heater valve

Post  944-LT1 on Sun Jul 19, 2009 9:46 am

Thats how it would work.

On late 44's, engine vacuum goes from the manifold, through the firewall and through a solenoid which is normally open which means it allows vacuum to the heater valve and keeps the heater valve closed. When the driver hits the switch, the solenoid closes, which cuts off vacuum and causes the heater valve to open allowing coolant to circulate through the heater core.

All late 944's have 2 solenoids (the other is for AC) on the passenger side of the heater box assy. under the dash.

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heater valve Empty Re: heater valve

Post  dallas on Sun Jul 19, 2009 6:58 pm

What I'm concerned about is will this valve recirculate back to engine for the no bypass in the engine condition on these LS motors, if it is put in backwards. I placed the inlet side of the valve on the engine side. I figured that would be correct. After I installed it it seems Alittle leakby is present even if the valve is closed. this will still recirc for the warmup till the t-stat opens. Full flow will come when valve opens. Thanks.

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heater valve Empty Heater control circuit

Post  fliermike45 on Fri Mar 11, 2011 5:56 pm

I have obtained a Everco 74781 vacuum operated heater valve from Autozone. it has four ports.
Can someone please help with a hookup schematic or suggestions.
Am I correct in assuming that when no heat is required the two heater ports on the LS1 should be linked together and allow water to circulate?
Thanks

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heater valve Empty Re: heater valve

Post  Admin on Fri Mar 11, 2011 8:42 pm

On the heater valve, there is four ports, two pointing each direction. the valve can be install either way. On each side of the vale has one large(3/4") and one small(5/8") barbs. There is really no way to get it wrong. And yes the LS motor recirculates the water when the valve is closed and no heat is needed.

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heater valve Empty Heater valve

Post  fliermike45 on Sat Mar 12, 2011 5:33 am

Thank you

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heater valve Empty Hooking up the valve

Post  fliermike45 on Tue Aug 23, 2011 1:17 pm

I'm actually cutting hose and fittings and would like to confirm where to put the Everco valve in the system depicted below.

Should it go in line 8 (across the heater core) thus bypassing the heater core when valve is closed?

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heater valve Empty Re: heater valve

Post  Arthropraxis on Tue Aug 23, 2011 4:53 pm

That doesn't look right. The H-valve goes in line from the water pump to the firewall. Here are pictures
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heater valve Empty H Valve

Post  fliermike45 on Tue Aug 23, 2011 6:25 pm

If I follow that route then lines 8 and 9 will never T at the surge tank.

Somebody posted the diagram as a method of LS1 plumbing, does it work though?
I wonder why 8 and 9 were plumbed to the surge tank, seems like 14 provides a path for expanded coolant to reach the surge tank and lines 8 or 9 to draw back the coolant when it shrinks. ????

If the H valve was plumbed only to the Heater core, where would the 3/4" oulet on the base of the surge tank connect to? My Griffin rad is modified with a vent port and a steam port. The filler neck was removed and closed off.

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heater valve Empty Re: heater valve

Post  Arthropraxis on Tue Aug 23, 2011 7:23 pm

The bottom port on the expansion tank connects to the Porsche radiator fill port on the passenger side radiator tank. The heater hoses with the H-valve in line go from the water pump to the firewall. The only T at the expansion tank is the steam line from the motor and the steam line from the radiator.
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heater valve Empty Coolant routing

Post  fliermike45 on Tue Aug 23, 2011 9:40 pm

OK, Thanks, my radiator is a Griffin, not using any Porshe plumbing.

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heater valve Empty Re: heater valve

Post  Arthropraxis on Wed Aug 24, 2011 6:51 am

You don't have a fill port on your radiator? What is the diameter of the vent port?
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heater valve Empty Ports

Post  fliermike45 on Wed Aug 24, 2011 8:11 am

Two ports on the rad, one is 1/2" diameter other is for the steam line 1/4" diameter.
Filler has been sealed off.

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heater valve Empty Re: heater valve

Post  Arthropraxis on Wed Aug 24, 2011 11:27 am

Connect the expansion tank to the half inch port on your radiator. The hose may need a reducer to fit.
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