Ensure your semi is Ready for the Road Ahead™ with reliable AC that activates when needed, with the Airsource 12V 10-20A 5-Terminal SPDT A/C Relay. Once directions are received from a user, this replacement relay sends an electrical current to the compressor clutch to activate the air conditioning system. A bad relay will often include symptoms such as an unresponsive switch, clicking noises, or unexpected AC shutdown. The air conditioning and heating system in heavy duty trucks has a major impact on drivers’ safety and comfort level. Whether you are looking for A/C compressors, condensers, driers, freon, or blower motors, FleetPride has the part you need to make sure your air conditioning and heating are well maintained. Keep your heavy duty fleet operations working as productively and efficiently as possible by finding the right air conditioning and heating part for you. FleetPride is your First Click in Heavy Duty®.