If the Panteras are equipped with the oem York a/c compressors, then that's the problem. By now they leak very badly, can't hold freon, & recharging constantly with R12 is expensive. To swap to R134A is also expensive.
So the owners have chosen to run without them.
The path of least resistance would be a new compressors & drier, a good flushing, a 24 hour purging & a refill with a/c compressor oil and R12 at $30+ per pound.
However, if you have replaced the compressor & drier, you are 1/2 the way towards what is needed to convert to R134A.
cowboy from hell
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