Mercury 6M6Z-19849-AA Valve Assy - Evaporator Expansion

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The orifice tube, located in the condenser to evaporator line, changes high pressure liquid refrigerant into low pressure. Before working on the air conditioning system, have it discharged by a professional. For 2007 and earlier models, disconnect the refrigerant line from the condenser to the evaporator, remove the protective cover, release the coupler with a special tool, and use pliers to remove the orifice tube. Discard old O-rings when installing a new tube. For 2008 and later models, remove the expansion valve by detaching the nut from the refrigerant line fittings, removing the block and lines, and discarding the seals. Remove the expansion valve and discard the O-rings. Replace seals and O-rings when reinstalling, and have the system evacuated, recharged, and tested by a professional.

The orifice tube is responsible for changing high pressure liquid refrigerant into a low pressure liquid.