The A/C compressor pressurizes refrigerant gas, the first step in the cooling cycle that produces cold cabin air.
A belt-driven (or electric on EVs) piston or scroll pump compresses low-pressure refrigerant vapor into a high-pressure gas, sending it to the condenser.
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Replacement runs $700–$1800 including parts and 2-6 hours labor. Exact cost depends on vehicle, parts tier (OEM vs aftermarket), and local labor rate.
Expected lifespan is 100,000-150,000 miles. Driving conditions, climate, and maintenance affect real-world life.
Warm A/C; Loud noise with A/C on; Clutch will not engage; Refrigerant leak at compressor seal; Seized pulley.
Most modern a/c compressors are sealed units that get replaced rather than rebuilt. A shop will diagnose, confirm with a load or output test, then swap the unit and verify operation.
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