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Re: Air Conditioning Charging
Posted by David Prantl (more from David Prantl) on Sat, 22 Jun 2002 17:27:43
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>  Do I need to add compressor oil before I charge the  refrigerant (I did 
>not replace any part but the seal) ?

>  how much oil I need to add 4 oz or 8 oz ?

Assuming you had the correct amount of oil in the system before the leak 
started, the amount you need to add will be equal to the amount that leaked 
out.

If you have no way of knowing how much leaked out, you should have a 
competent shop flush the system for you and check the oil level in the 
compressor.  The goal is to end up with the correct total oil quantity in 
the system.

Total oil capacity of your A/C system is about 6 oz.  This includes the oil 
in the compressor, condenser, evaporator, receiver/drier, hoses, etc..

>  (I understand it's illegal to release the freon and charge  the 
>refrigerant without evacuate the system)

Venting refrigerant to the atmosphere is illegal pretty much everywhere.  
Charging your own system is legal in most places, as long as you don't get 
paid money for doing it for someone else, and as long as it isn't R12.  This 
is supported by the fact that you can buy R12 refrigerant and Ester oil 
off-the-shelf at your local Wal-Mart or AutoZone.

Either way, a deep vacuum (29' HG) needs to be drawn on the system for about 
30 minutes to remove air and mositure, *before* the system is charged with 
refrigerant.

Official SAAB R134a retrofit procedures call for about 30 oz of refrigerant 
to be charged into an empty (completely evacuated) system in a C900.

>  Can I add Lok_tite on the thread?

NO !  The threads do not seal anything.  The seal is made by means of an 
o-ring.  The o-ring should be lubricated with the appropriate compressor oil 
before installation.  The threads should be clean/dry, or coated with 
anti-seize for easier removal in the future.

David.
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