Prepare your semi truck to be Ready for the Road Ahead , with the Honeywell R-1234yf Refrigerant that helps provide reliable AC. By absorbing the warm air from inside of a vehicle's cabin, this replacement refrigerant helps optimize an AC system by allowing it to blow cold air to the best of its abilities. Contaminated refrigerant that needs to be filtered or changed shows symptoms such as warm air, grinding sounds, or frost on AC components. FleetPride is your First Click in Heavy Duty .