The air conditioning lines condense cold air (works like a radiator), acts as a filter, pump liquid gas through the system, create cold air intake through air vents and transport gas to each system|
The compressor is the heart of an air conditioning system. It takes refrigerant as a low pressure gas, pumps it up to a high pressure gas, and circulates it into the discharge hose. Compressors are much like little engines. Most of them have pistons, piston rings, a crank shaft, and bearings, just like a car engine. They need to have oil circulated through them to lubricate all the moving parts. This oil is mixed into and carried with the refrigerant. That is why running an air conditioner without any refrigerant is like running your cars engine without any oil.