A/C Compressor
An engine-driven pump that pressurizes and circulates the refrigerant throughout the air conditioning system, facilitating cabin cooling.
The A/C compressor is the core component of a vehicle's air conditioning system, often referred to as the heart of the HVAC system. It is driven by the serpentine belt. When the A/C is turned on, an electromagnetic clutch or control valve engages the compressor, which draws in low-pressure gaseous refrigerant, compresses it into a high-pressure, high-temperature gas, and pumps it toward the condenser.
Because the compressor is a highly complex mechanical pump, it requires special lubricating oil mixed with the refrigerant to prevent internal friction and wear. If refrigerant leaks out of the system, this critical lubricant is also lost, which can lead to the compressor seizing or failing completely.
Common symptoms of a failing A/C compressor include blowing warm air from the vents, screeching or clunking noises when the A/C is turned on, or the compressor clutch failing to engage. Replacing a failed compressor usually requires evacuating the system, replacing the receiver-drier/accumulator, and flushing the lines to remove metal debris.