Your travels can take you through may different climates and weather conditions. Your HVAC system heats, cools, and ventilates your vehicle's cabin during the drive. How HVAC works in cars and trucks isn't too complicated. Your heating system is a lot like a radiator. It pulls hot coolant from your engine into a small heater core. A front-mount fan blows cooler air from outside over the core's fins. This keeps your interior warm while you drive in the cold. Your factory GM AC system, however, is made up of four different parts. Its compressor, for one, first pressurizes refrigerant and converts it to a hot gas. Next, a condenser cools the gas, turning it into a liquid. That fluid then passes through an expansion valve, becoming a gas again, at low pressure. Finally, an evaporator cools the gas down rapidly using a fan. The resulting chilled air heads through your ducts, out your vents, and into your cabin, keeping you comfortable in warmer temperatures. Eventually, though, even the best AC systems' seals can weaken. Their hoses can degrade or break. Even your AC compressor can go bad. The key sign your car air conditioner isn't working, though, is when it isn't cooling properly. This could mean either leaking refrigerant or low levels of it. Luckily, when it's time for a repair or replacement, you can buy genuine GM AC system parts right here online, and for less. Explore our selection and place your order today. We'll have it out to you in no time!