A Subaru automobile has an optional air-conditioning system that uses a pulley driven compressor that turns with the motor. This compressor can wear out because of a lack of lubricant or damage to the clutch plate. The average backyard mechanic can replace a compressor on a Subaru engine in about an hour and a half.
Evacuate the A/C system by taking the Subaru to a refrigerant collection facility. Most garages and oil change stations have professional equipment, and they will typically evacuate the system for free because they get compensated for it.
Disconnect the battery by turning the positive terminal bolt counterclockwise.
Disconnect the refrigerant lines from the compressor by turning the line nuts counterclockwise. Leave the lines connected to the air-conditioning system.
Disconnect the wiring harness from the compressor by pulling the adapter plug from the terminal.
Remove the drive belt from the compressor's pulley wheel by pressing firmly against the tension pulley arm to slip the belt out from underneath the idle pulley. Once the belt is free from the idle pulley, release the tension pulley arm and you should have enough slack to slide the belt from the compressor pulley wheel.
Remove the compressor by turning the mount bolts counterclockwise and sliding them out of the mounting arms. Manipulate the compressor out of the mount.
Replace the compressor by sliding it into the mount arms and tightening the mount bolts in a clockwise direction. Replace the wiring harness connector by pressing the adapter plug into the terminal.
Reconnect the refrigerant lines by turning their line bolts in a clockwise direction until they are snug.
Wrap the drive belt around the compressor pulley wheel. Press the tension pulley arm and slide the belt underneath the idle pulley. Release the tension pulley and the belt will tighten.
Reconnect the battery at the positive terminal by turning the mount bolt in a clockwise direction.
Refill the system with the proper amount of refrigerant by using a kit or taking the Subaru to the collection facility to reuse the old refrigerant.
