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steven c's Avatar
 
Join Date: Jul 2008
Location: Dallas, TX
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Need some help on 965 AC recharge

It's spring in Texas and time to use the AC on my 91 turbo. Mine is low on 134 as it has been converted so I need to know the amount of 134 and pressures I should hit after I pump the system down. This is my first use of a vacuum pump so any pointers appreciated. Thanks!
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 03-30-2010, 04:44 AM
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It is all in the owners manuel if you have it. If not pm me and I can take a photo of it and e mail it to you.
Old 03-30-2010, 05:06 AM
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Quote:
Originally Posted by 964 T #304 View Post
It is all in the owners manuel if you have it. If not pm me and I can take a photo of it and e mail it to you.
I don't have it handy but I assume 134 is different than R12 which it came with?
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 03-30-2010, 05:50 AM
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It is . I have a 92 and the manual has both listed as they made the change for the 93 year model which started in oct. I belive of 92. It says to use 1. 85lb of r134a, 0.7oz nd 8 ,compressor oil.Your head pressures depend on the ambient temp where you are at. @ Dallas you might have a temp of 77 deg today so the high press. would be 218 and the low would be about 8 to 14 psi. Like I said if you pm me an e mail add I will take a photo of the chart and e mail it to you . I am down the road a peice in Beaumont.
Old 03-30-2010, 10:56 AM
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PM sent. Thanks!
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 03-30-2010, 11:18 AM
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If you're doing the evacuation and charge yourself and you know nothing about it, you'll find alot more information with searches over on the technical forum.

There's alot of subtle things to know and you can hurt yourself if you don't know what you're doing.
Old 03-30-2010, 11:23 AM
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I know enough to be dangerous for sure...I have done the searches here and on Rennlist so I am getting up to speed slowly. I do have a mechanic who is working me through this also over the phone when needed but he isn't a Pcar guy.
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91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 03-30-2010, 11:32 AM
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Quote:
Originally Posted by 964 T #304 View Post
It is . I have a 92 and the manual has both listed as they made the change for the 93 year model which started in oct. I belive of 92. It says to use 1. 85lb of r134a, 0.7oz nd 8 ,compressor oil.Your head pressures depend on the ambient temp where you are at. @ Dallas you might have a temp of 77 deg today so the high press. would be 218 and the low would be about 8 to 14 psi. Like I said if you pm me an e mail add I will take a photo of the chart and e mail it to you . I am down the road a peice in Beaumont.
Are these pressures normally read at idle or at 2000rpm? Porsche manual says 2000rpm, but the shops i've seen read things at idle.

What's correct?
Old 03-30-2010, 12:03 PM
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He doesn't need to be a Porsche guy.
R134 AC systems are basically the same in all cars, just most newer cars use a fixed orifice just before the evaporator instead of an expansion valve and the 911 system NEEDS to be evacuated for at least 3hours nonstop to boil and suck out all the moisture in it's 40+ feet of AC lines throughout the car and the front condensor and the evaporator which are in the front part of the car so a good complete evacuation takes a while.

Be sure to back purge all the air out of the manifold gauges, and then purge the air out of the yellow hose before charging. Do that by partially unscrewing the yellow hose from the manifold gauges and letting air escape until refrigerent is coming out. The threads the yellow hose screws onto is partially slotted just for this purpose.
There is a sequence to this and it along with the math and pressure table relating to ambient temperature are just some of the subtleties to a proper charge.
Old 03-30-2010, 12:11 PM
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