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Disconnect the lower line from the evaporator and pull the tube out with needle nose and make sure you have a firm grasp. Pay attention to arrow direction of refrigerant flow. The cab does not have an expansion valve on orifice tube system. The bunk may have expansion valve and it is mounted inline at the evaporator inlet.To use an auto air conditioning manifold gauge set, close the low and high valves on the set and connect the hoses to the low and high fittings on the air conditioner unit. Turn on...

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While your adding watch and make sure your engine fan still cycles. Then turn fan speed for blower motor to 2 and make sure the compressor will cycle off at some point. The system cycles off of pressure because there is no freeze switch. So the system is very sensitive to proper charge.

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