How to Troubleshoot A/C Problems in Freightliner Trucks Freightliner AC systems are much larger than most vehicle systems, and they use a larger condenser and an air compressor to cool the air. An evaporator is used on freightliner trucks as a heat exchange medium to move the heat generated by the system away from the air conditioning unit. The most common problem with a Related searches for freightliner m2 ac wiring diagram freightliner m2 wiring diagramsfreightliner m2 wiring diagram pdf2010 freightliner m2 wiring schematicfreightliner m2 electrical diagram pdffreightliner m2 schematicfreightliner wiring diagrams free2016 freightliner m2 wiring schematicsfreightliner electrical wiring diagrams