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Old 04-24-2011, 05:17 PM   #1
RGZ
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1998 SL2
Default 91 SC A/C Freon

I want to charge my A/C but don't know what kinda Freon to use and how much to use?

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Old 04-24-2011, 06:33 PM   #2
OldNuc
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1998 SC2
Default Re: 91 SC A/C Freon

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Originally Posted by RGZ View Post
I want to charge my A/C but don't know what kinda Freon to use and how much to use?
If it has not been converted it used R-12 and if converted R-134a. There should be a conversion label or you can tell by the charging connections.

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Old 04-24-2011, 06:43 PM   #3
fdryer
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2003 L-Series 3.0L Sedan
Default Re: 91 SC A/C Freon

The original freon used in '91 was R12 that's no longer used. Change occurred around '94 to R134a and conversions were available to switch over; some oil was injected to allow R12 oil work with R134a, two new R134a service valves are installed so only R134a can be injected. The way to tell is to examine the two fittings; old R12 are externally threaded and these threads are visible, R134a have no threads and use a quick coupler similar to air tools using quick connects. R12 fittings are the same whether on the high side or low side. R134a have two different sized fittings to prevent accidents from anyone trying to feed R134a into the high side. Operating pressures on the high side can exceed 250psi and easily cause an explosion hazard to anyone foolish enough to try the wrong coupling. Industry design prevents this from occurring.

It may be wiser to find the source of the leak before trying to refill a system that may be leaking. Like a slow leak in a tire, refilling a leaking system is just a band aid and not a repair. Perhaps you need to know the basics; http://www.saturnfans.com/forums/showthread.php?t=80107

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Old 04-24-2011, 09:36 PM   #4
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1994 SL2
1999 SL
Default Re: 91 SC A/C Freon

Yes, the early model Saturns used R12 and then the conversion over to R134a happened in the mid 1994 model year.

If I remember- I believe that if you still wanted to get R-12 before it was discontinued; you had to have a repair shop do the fix because of federal regulations. I don't know what it is now for R-134a... but as FDryer mentions; its better to have system checked over rather then just throwing cans of Freon at the car...

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94SL2 HCE, "Pearl"

99 SL

94SL2 260K Miles
1/15

97SW2 266K Miles
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Always
94SC1 340,501 Miles
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2/97-10/08
Gone 3/12

92SL1
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91SC

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