Product Details: Prepare your semi to be Ready for the Road Ahead™, with the Airsource 12V 30-40A 5-Terminal SPDT A/C Relay that reliably activates the AC when needed. Upon receiving directions from a user, this replacement relay sends electricity to the compressor clutch to engage the air conditioning system. Possible symptoms of a bad relay include unexpected AC shutdown, clicking noises, or an unresponsive switch. 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®.