sms states "there is no freon in the system".
I'm NOT suggesting a mixture or "top off", but rather a test and then EVACUATION. Total flush of system would suit me fine also, since it's been inoperative for a while. My use of the word "compatable" refers to the dessicant material in the dryer, refrigerant oil and "O" ring materials used in the R12 system, not inter-gas compatability.
The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)