Are you an ac technician? Were do you work???

>
>
>Mick,
>
>R12 does not "go bad" like beer going flat or clothing going out of
>style! It seems your tech does not understand how the principles of
>evaporation & condensation "move heat". The compressor should exert
>pressure on the high side (condensate zone)while drawing on the low side
>(evaporative zone). During the "change of state" the evaporating
>refrigerant absorbs massive amounts of heat.
>
>The compressor provides the labor for the high side pressure and low
>side pressure drop with the expansion valve acting as a referee to
>manage the "change of state"! The closer the high and low side pressures
>are to each other, the LESS efficient the process is. Typically a normal
>High side is 185-205 psi and the low side is 15-30 psi. Either your NEW
>compressor isn't working (NO LABOR), the NEW expansion valve isn't
>working (NO REFEREE) or you have a foreign agent like dirt, moisture or
>PAG oil in your R12 system negating the necessary valving action. Your
>high & low side pressures are too close and the system is grossly
>overcharged to overcome the non-functional part or the effect of the
>foreign agent. I think you need a new technician........if you'll pay my
>expenses, I'll come out and fix the system to function correctly!
>
>Regards,     John

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