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91 240 A\C conversion 200 1991

posted by  someone claiming to be millere on  Mon Sep 23 10:35 CST 2002 [RELATED]

I'm trying to do a R12 to R134 conversion on my 1991 240 volvo. Its the system with an accumulator instead of a dryer(first year for that system to my knowledge). I hooked up a gauge to the low P side and get 70-75 psi with the engine off; this drops to 25 psi when the compressor cycles on. Jumps back up to 75 within 1-2 seconds when the compressor cycles off. Is this normal for the low pressure side, or is something malfunctioning? Also have been unable to find high P side access port; low P port comes off of the accumulator. Any other suggestions on this conversion would be great.






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