The clutch on the compressor falling off has nothing to do with an R134a conversion. The securing nut was just probably loose and finally gave way. I've seen two other Schassis cars do the same thing.
How much air is blowing out of the vents? If the lever is set to fresh air it will always blow, even with the fan off, as air is being pulled from outside through the vents. All cars do this. If the fan is actually blowing with the switch off, the blower resistor is bad.
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