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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A/C questions

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A/C questions

Post  hutchjc1 on Tue Jan 05, 2016 9:49 am

What have folks been doing for a/c systems ? I have a new condenser from TPC, not sure if it uses the stock 944 lines or GM lines but will contact TCP to verify, but have not gotten to that point yet, just trying to prepare for the next step. So I am looking to see if I would use all new GM (or equivalent) parts meaning the compressor and dryer and adapt the lines to fit the 944 fittings at the firewall or is there a better way to do this ? I have the stock compressor from the donor Camaro and I believe the dryer ( I believe that is the correct name for it ) from the 944 but have always heard that you want all of the components clean and uncontaminated so I would buy new parts so there are no issues. I have never dealt with a/c before, are there places that fabricate "custom" lines for these applications or do you adapt the 944 lines to the system after cleaning ? Any advise or alternatives would be greatly appreciated. If I am way off base please let me know !
Thank you for your time !
Jim

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Re: A/C questions

Post  docwyte on Tue Jan 05, 2016 10:53 am

The only GM part in my A/C is the compressor I believe. I'm using the stock 944 A/C condenser and receiver/dryer. Custom lines were made.

You have to have a really efficient fan setup, otherwise you won't move enough air across the condenser for things to cool, especially if you have a thicker than stock radiator like the Ron Davis.

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Air Conditioning

Post  simon123 on Tue Jan 05, 2016 12:37 pm

The GM Compressor uses a variable Refrigerant Control Valve. To use the GM compressor with the Porsche fixed pressure system (Dryer/Receiver etc etc) you have to remove the valve from the compressor and seal the end with a touch of alloy weld.
If you PM me your email address I will send you the pdf file that describes the process with pictures.

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Re: A/C questions

Post  hutchjc1 on Tue Jan 05, 2016 12:39 pm

PM sent
Thanks for your help !

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AC

Post  simon123 on Tue Jan 05, 2016 12:55 pm

File sent, good luck.

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Re: A/C questions

Post  erioshi on Tue Jan 05, 2016 2:32 pm

Some of that will depend on your specific AC compressor. Not all GM AC compressors use the variable valve, but I believe that most GM vehicle OEM equipped units do. The kit I had ordered for front end accessories included a new new GM AC compressor that was part of their aftermarket catalog and not a variable type.

More details are available in this thread: [You must be registered and logged in to see this link.]

The third post mentions the non-variable compressor.
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Re: A/C questions

Post  zeusrotty on Wed Jan 06, 2016 9:39 am

I used the stock camaro or firebird compressor and I welded the valve inside it shut.

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Re: A/C questions

Post  hutchjc1 on Wed Jan 06, 2016 9:46 am

Ok sounds like the 944 system adapted to the ls1 ( in my case Camaro ) compressor with the valve tip welded shut per the pdf from Simon123.
Thanks for all of the help !

Next I will be looking for info on what wiring / hoses can be removed from the engine compartment to clean it up, I bought the car with the LS! installed so I don't know what is left over from the turbo motor. I will make a separate post for that one.
I really do appreciate the help !

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A/C Question

Post  wallstreet804 on Wed Jun 15, 2016 11:51 am

Hello Folks, wanting to know from previous discussions on removing the A/C compressor variable valve...what year 944 are you talking about? This is my third compressor on a 1989 in 5 years. Just want to know if any specific year car this refers or we talking every year.


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Re: A/C questions

Post  Arthropraxis on Wed Jun 15, 2016 6:10 pm

I remember someone removing the o-ring from the variable valve vs welding the tip shut.
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Need help with A/C set up

Post  jess2suityou on Sun Jul 10, 2016 11:57 pm

I have the same questions as well about the a/c set up. Can someone please share with me the method an process used to get the a/c functional in our cars. I'm running the f-body LS1 set up an compressor in my car but I'm not exactly sure how to hook things up. Some pictures and parts used to get it to work would be a great thing. I'm pretty sure I can get some lines made to adapt the GM compressor but would like to know exactly what to do step by step. I have never dealt with an a/c system other than adding freon. I also know that I need to replace a few items such as the dryer which seems to be pretty straight forward. And maybe even my compressor. I'm not sure if it is even functional at this time because the lines have been open and exposed to the elements. Any advise, guidance, and illustrations will be greatly appreciated. I'm looking forward to having the a/c working in my car. It's the only thing that prevents me from driving it more often during the summer.
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Re: A/C questions

Post  924LS on Mon Jul 11, 2016 3:05 pm

I'd like to know as well

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Re: A/C questions

Post  EXPAlien on Sun Jul 30, 2017 3:46 pm

Myself as well

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A/C

Post  gdopnt on Sun Jul 30, 2017 10:54 pm

I am doing A/C right now,  here is some info to get ya to started.  The valve in the GM compressor needs to be sealed, most TIG weld it.  This makes  it run on demand and the Porsche system then uses pressure sensors to operate the compressor.   I heard one person epoxied the tip but I don't know how that worked for him and that car has been sold.  Tapping into the Porsche wires to control the system is easier. The Porsche A/C wires are on driver side frame rail, by doing this the Porsche system controls it all (when you push the button it turns the compressor and fans on, no extra wiring.) The big hose coming out of the HVAC unit is cut and a crimp-able  aluminum hose end can be brazed on, then the hose can be rerouted. I bought the hose crimping kit to do mine and it took 20 minutes to crimp all hoses. The small hose coming out of the condenser was cut and I spliced a union with a port for the pressure side. The difference between years 86 and 87 (I have an 86 4 cylinder and an 87 LS1) years is the placement of the high pressure port on 86 is at the accumulator/dryer behind the driver head light, and the 87 had it on the compressor. You'll need to go to junk yard and get the electrical connector for the GM  A/C unit. The GMC Jimmy has it right in the top- front of the motor easy to cut. I bought fittings and hose from  Auto A/C fitting in Florida but eBay as well. The suction side has a #10 hose and the pressure side is a #8. I did have to get a new manifold block, some use pointing down and some use pointing straight out ( I used straight out.)  I can take pics of locations and fittings, and hose routing and post them.

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Re: A/C questions

Post  acorad on Mon Jul 31, 2017 12:17 pm

fwiw, regarding the valve, iirc, when I did my AC years ago, I just took off one of the rings. Maybe the middle one? Really don't remember which one exactly. Did not weld the orifice. AC worked great. Pretty sure all the info is here on the forum, I think it's pretty searchable.

Andy
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AC System

Post  wallstreet804 on Tue Sep 19, 2017 7:24 pm

Simon123, can you please post the info about welding the Variable Valve. Thx

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Re: A/C questions

Post  Arthropraxis on Tue Sep 19, 2017 8:08 pm

Good info on making the lines.
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Re: A/C questions

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