A heart is considered as the most integral part of the human circulatory system. Its task is to allow blood to circulate around the entire system through pumping, but when it stops beating, the whole system will stop functioning. Like humans, a vehicle has also a component that functions like a heart that is in the form of the AC compressor. In your Pontiac air conditioning system, your Pontiac AC compressor is considered as the most important and considered as the heart of the system. The AC compressor is controlled by a belt otherwise known as the AC compressor pulley connected into the engine. This belt essentially engaged and disengaged to the AC compressor by the AC compressor clutch. When it's engaged, your Pontiac AC compressor will function just like the human heart, it significantly pumps the refrigerant of the vehicle's air conditioning system through the several parts of the air conditioning system in a closed loop. The AC compressor takes the low pressure refrigerant gas coming from the inlet side of the AC system also known as low pressure side that is comprised of an accumulator and an evaporator or the receiver or direr. While in the compressor, the refrigerant is being compressed and changed into a high temperature gas and high pressure. After it was compressed, the hot refrigerant is then dispelled into the condenser and delivered back into the evaporator so as to form the close loop. Similar to the human heart, it is also defenseless to any harmful elements that may cause damage which will largely affect the entire mechanism. To avoid this, checking it from time to time is imperative. But if you consider buying a new one for your car, you can check out our catalog where you can choose among our huge explosive line of top quality Pontiac AC compressors.