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Mike King

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  1. Mike King's post in Air Expansion valve was marked as the answer   
    The large port on the tx valve is for the low pressure return fitting on the pipe to the suction port of the compressor. This fitting is usually at the top and will be facing away from the fire wall. The smaller port under it is for the liquid line from the 'out' side of the receiver drier by the condenser in front of the radiator. The other two fittings on the opposite side are for the evaporator pipes poking out through the fire wall. O'rings have to be fitted at each fitting.  The flow of the a/c is compressor to condenser to receiver drier through tx valve to evaporator returning through tx valve to compressor.
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