I'm still trying to figure out why my compressor will not come on. The compressor is fine, it's just not getting 12 volts to it to turn it on. I installed a new a/c anplifire(that's how toyota spells it) and I can hear it working but voltage still does not reach the compressor. I discharged the r-12 and took the evaporator case out and tested the low pressure switch and the expansion valve. They seem to be in spec. I found a relay that may not be working properly but I wont know till I put it all back together. I found out from the place that evacuated the r-12 that it is costing about $75.00 a lb.