Do not install the A/C compressor into a system unless you are completely sure that the system is free of contamination. Installing the A/C compressor into a contaminated system can result in premature A/C compressor failure. Refer to the A/C System Contamination Inspection.
If the A/C compressor is marginally operable, run the engine at idle speed, and let the air conditioning work for a few minutes, then shut the engine off.
Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
Be careful not to damage the radiator fins when removing the A/C compressor.