My daughters 1992 240 had a refrigerant leak. I decided to replace the compressor and drier, and change to R-134.
I flushed the evaporator and condenser with denatured alcohol, and replaced the R-12 orifice with an adjustable orifice.
I installed a new Sanden 7 cylinder compressor.
I installed a new accumulator.
I replaced the low pressure switch, and all O rings.
I vacuumed it for 24 hours.
I mearured the R-134 charge ( 80 % of R-12 charge. )
Results are it doesn’t work. It shuts down on low pressure often enough to prevent proper cooling.
Also it makes strange noises; Like a motorcycle in the distance hauling ass,
And when you turn the car off there is a lot of equalization noise.
I am nearing my wits end. Any thoughts?
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