Equip your semi truck to be Ready for the Road Ahead , with the Weitron R-407c Refrigerant, a key piece that helps provide reliable AC. Due to its ability to absorb the warm air inside of a vehicle's cabin, this replacement refrigerant is able to optimize an AC system by allowing it to blow cold air to the best of its abilities. Bad-quality refrigerant that needs to be filtered or changed shows signs such as warm air, grinding sounds, or frost on AC components. FleetPride is your First Click in Heavy Duty .