r134a posted by ouikikazz on September 02, 2008 at 07:52 PM
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You had to unhook the hoses, which would cause atmospheric air into the system, including moisture. Any small amount of moisture will cause an issue as it will boil, and cause an air pocket which will prevent the compressor (and the whole system) from working properly.
Since you swapped out the whole compressor and depleted the entire system, you will have to have it evacuated and recharged with r12 (if you can find it) or a compatible r134a. Most 134a's sold now day's are compatible, you will just need the small retrofit adapters for the high and low pressure ports. The system will need to be evacuated, which actually boils the moisture out of the system by introducing a vacuum to it. This can be done with a fairly inexpensive air powered vacuum ( I use a matco unit that requires ~5.0cfm ) and then adding the proper amount of refrigerant. Or you can just go to your local service station and pay them $75 which usually includes the evacuating and fill of proper refrigerant.
