Assuming you have HVAC experience and are licensed to perform this service, you'll first need to recover the R-134A refrigerant from the system (if there's any in it). If there isn't, you'll still have to vacuum before recharge (w/refrigerant & PAG oil). Is there a compressor presently installed?
If so, you'll need to recover any existing refrigerant. Then disconnect the High & Low pressure tubes from the compressor.
Remove the A/C drive belt
Remove the wire harness connector to the compressor magnetic clutch
Remove the 4 12mm bolts which mount the compressor to the engine
Raise the vehicle & remove the FR wheel, plastic splash guards (RH & lower - below the oil filter).
Raise the engine so to increase/clear space for removal of the compressor.
Installation of 2nd compressor is in reverse order.
PS. Some technicians perfer to remove the compressor from the top (requires removal of the radiator cooling fan & the alternator). Some have also removed the LH Exhaust Manifold to make it easier to reinstall the alternator & compressor.
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