Product Details: Outfit your semi to be Ready for the Road Ahead™ with reliable AC that activates when needed, with the Airsource 12V 35-20A 5-Terminal SPDT A/C Relay. After receiving directions from a user, this replacement relay sends electricity to the compressor clutch to engage the air conditioning system. Relay failure will often show symptoms such as clicking noises, an unresponsive switch, or an 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®.