How to Replace the AC Compressor in the Car
Most cars use a belt driven compressor to circulate freon through an air conditioning system. This freon coolant is used to lower the temperature of a condenser, which has a fan that blows the air into the cabin. The compressor can wear out and fail, and will require replacement. The average backyard mechanic can replace a compressor in most vehicles in about two hours.
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Instructions
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1
Have the air conditioning system evacuated of all freon coolant by a garage or oil change center. (They will usually do this for free using professional vacuum equipment, because they get reimbursed for each pound.) Do not vent the freon into the atmosphere.
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2
Disconnect the battery by turning the positive terminal bolt counterclockwise. Store the terminal away from the battery.
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Disconnect the wiring harness from the compressor by pulling the adapter plug from the compressor's blade terminal.
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4
Uncouple the freon lines into the compressor using the line wrench to turn them counterclockwise.
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Remove the belt by either pressing on the tension pulley arm and using the slack to slide the belt from the idle pulley (serpentine), or by loosening the compressor's adjustment and mount bolts and using the slack to remove the belt (single belt system).
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Replace the compressor by turning all mount bolts counterclockwise, while holding the bolt head or nut with a socket wrench. Slide the bolts out of the mount, and the compressor will come out. Position a new compressor into the mount and slide the mount bolts through the mount arm holes. Secure the compressor by tightening the bolts clockwise. If using a serpentine belt system, tighten all bolts firmly; if using a single belt system, leave the bolts slightly loose for adjustment.
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Reconnect the freon lines by turning the bolts clockwise, then reconnect the belt to the pulley wheel by wrapping it around the wheel and using the adjustment bolt or tension pulley arm to tighten the belt to the proper tension. Reconnect the wiring harness adapter plug. Reconnect the battery's positive terminal.
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Have the freon recharged at a professional shop, or recharge it with a home kit.
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Tips & Warnings
Check the A/C system's fuses before performing this procedure.
Use extreme caution when working with freon--it can freeze skin in seconds.
