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Need R12 recharging help.

hondaman on Wed July 27, 2011 7:21 AM User is offline

Year: 1991
Make: Saab
Model: 900t
Engine Size: 2.0
Refrigerant Type: R12
Ambient Temp: 85f
Country of Origin: United States

I've only fixed R134 systems, never an R12 system. I found the leak in my AC, and will fix it today. Is the recharge procedures the same as r134? Specifically,

1) Vacuum it before charge. I vacuum on the low side port?
2) On the back of my compressor are some service ports. What are these used for?
3) When I charge it, do I need to have the RPM's up?


Thank you.

Dougflas on Wed July 27, 2011 12:39 PM User is offline

I always pull a vacuum thru both low and high side. After the guages settle down, I close the high side and only pull thru the low side. My reasoning for this is to make sure i'm not pulling oil from the compressor. Some systems have ports on the rear of the compressor, some don't, some have both. Use the most convenient locations. rpm's should be 1200 to 1500

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