RE: A/C pump - compressor
Generally speaking you don't try to rebuild the AC pump as it takes special tools. I just buy a rebuilt pump from a parts dealer or a commercial re-builder on any AC I have had in the past. You need a vacuum pump (can be rented in some locals), a set of AC gauges/with hoses, some cans of R134a and some compressor oil. Usually you want to flush the system and install a new dryer. It's expensive to have done, but some can be done yourself, if you have the tools. You need to take it to an AC shop to have the R134a removed before disassembly, this is by law.
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