Your vehicle’s air conditioning system has many parts that remove heat from the warm air entering its system. The compressor is known as the power unit of the air conditioning system that moves refrigerant, or coolant, around the pipe and puts the liquid under high pressure before it is pumped into the condenser. Your vehicle’s air conditioning system has many parts that remove heat from the warm air entering its system. The compressor is known as the power unit of the air conditioning system that moves refrigerant, or coolant, around the pipe and puts the liquid under high pressure before it is pumped into the condenser.