Update your semi with reactive air conditioning that only operates when directed, with the OTR 12V 5.78" York Style Clutch with Expertise Built In™. With the help of the AC compressor, this replacement clutch kit connects the drive power from the engine to the AC unit, leading to an engagement that activates the air conditioning. Specially engineered to free up power and increase fuel economy by removing power to the AC when it's not in use.