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 hose connection

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Heater hose connection

Post  Jim7 on Sun Jun 12, 2016 10:49 am

I did an advance search and found several references but wasn't able to resolve my questions. So here it is. I couldn't get the original coolant tank to fit and instead got a Dorman tank that has what looks like a 3/4" fitting on the bottom, a steam nipple on top and a nipple for the overflow. I fitted the Dorman tank in the Battery well so it sits up nice and high and just about over the heater hose barbs. I looked at the schematic showing the hose routing of the LS and see it goes through the heater and then to the tank with what looks like a 'T' connection.

Now if the 968 has a heater valve control already inside the heater box and controlled by vacuum actuated from the cabin why do I need the external 'H' valve? If the 'H' valve is needed how and where do find the vacuum control to open and close flow to the heater and how do I route the hose to the expansion tank?

Jim7

Posts : 51
Join date : 2010-09-19

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Re: Heater hose connection

Post  Techno Duck on Sun Jun 12, 2016 7:00 pm

For my conversion, i used a generic heater control valve that was readily available at my local auto parts place. The two ports on the side of the water pump are for your heater control valve; check out this picture for how i have it plumbed in.

[You must be registered and logged in to see this link.]

The vacuum source for the heater control valve comes off the firewall, there are 2 vacuum ports on the heater core console if i remember right(the part your heater hoses connect to). One port connects to your heater control valve and the other is the vacuum source from the intake manifold. The vacuum source i got off the back of my LS6 intake which has a few ports present for what i think was for the fuel vapor purge components. I connected this vacuum port to the one on the heater core console. I think there was a port also on the throttle body that can be used but i cant remember if it was before or after the throttle plate (it needs to be after).

The expansion tank just needs to be placed anywhere on the low side of the system like the radiator outlet. The heater ports on the water pump will probably work fine also, just remember to plumb it before your heater control valve.

Techno Duck

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Join date : 2010-12-01
Location : San Diego, CA

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Re: Heater hose connection

Post  matt889 on Sun Jun 12, 2016 8:44 pm

Do you have anymore pics of ur heater valve techno duck?

matt889

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Age : 29
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Re: Heater hose connection

Post  Techno Duck on Sun Jun 12, 2016 11:49 pm

I don't, but i have the part # saved on another computer. Ill post it tomorrow. It was a readily available part at AutoZone however, no special order or anything.

Can post more pictures of how i have it plumbed in about 2-weeks when i get back home.

Techno Duck

Posts : 447
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Location : San Diego, CA

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Re: Heater hose connection

Post  Jim7 on Tue Jun 14, 2016 1:49 pm

The 'H' valve I got was also a Dorman and looks simple enough. Which vacuum line do I use? Obviously it's one controlled by the selector on the in-cabin controls but how do I figure out which one?

Jim7

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Re: Heater hose connection

Post  phlip on Thu Jun 16, 2016 1:53 pm

In Alldata it shows a pic of the evap. case and shows the connection that is slightly lower and slightly closer to the center of the car is for the heater valve. The other is supply which goes to manifold vacuum source. I think there is supposed to be a check valve on the supply hose also.
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phlip

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Re: Heater hose connection

Post  Jim7 on Mon Jun 20, 2016 4:06 pm

Thanks. I arrived at the same conclusion. The upper line is the supply and the lower is the control line that goes to the 'H' valve.

Jim7

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