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We went through the fsm diagnostic tree, that's how We determined the switch was bad. It isn't the standard two prong switch, this one sends ac pressure information to the computer. The car has the automatic temperature control. That is what is throwing me off.

Yes, I did vacuum the system and add oil. That was all implied. I have jumped the low pressure switch.... Nothing happened. That's why We looked into the high pressure switch. It is throwing a dtc 66... Everything I have found shows that being the high pressure switch.

I am trying to fix the ac on my dad's 93. It had blown out the condenser, so it lost all of it's r12. We decided to replace itwith r134. I replaced the condenser, drier, orifice tube, and flushed out all the rest of the system. I went to recharge it, and got a can into it. the compressor started...