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Old 12-06-2017, 04:36 PM   #51
david29
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ABSOLUTELY !!!

And if you remove a sender or loosen a fitting where your refrigerant will gush out, you'll also lose a lot of your refrigeration oil, good luck at guessing how much to add back to get to the correct level.

I'm not a full AC expert, but living in Arizona have gotten "pretty good". If you still have an AC issue once spring rolls around, I'd say read both high and low side AC pressures with real gauge set at about 1800 rpm, and tell us if your 1991 still has R-12 or if someone has converted it to R134a.
Or just look at the Freon input points. If converted to 134a, then the shradder valves will have the 134a adapters on them.
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Old 12-06-2017, 11:35 PM   #52
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Or just look at the Freon input points. If converted to 134a, then the shradder valves will have the 134a adapters on them.
That USUALLY is a good indicator. Not only have I heard of converted systems having only a R134a conversion adapter on the low side service port, someone like myself could readily convert to R134a and yet retain the R-12 service valves/ports.

Legally, a converted AC system must have a sticker under the hood that details the conversion.
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