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Re: Blower wiring 09 FREIGHTLINER CASCADIA
Posted to HD/Fleet Forum on 5/25/2018

You are correct on a Cascadia the compressor will not engage unless the HVAC control head sees a speed signal from the blower. It's mainly to keep the evaporator from freezing. The HVAC system uses a "nicked seat" expansion valve that allows some refrigerant t... Login to read more.