Ford DG9Z-19849-A Valve Assembly - Evaporator Expansion

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There are several ways that air conditioning systems convert the high-pressure liquid refrigerant from the compressor to lower-pressure vapor. The conversion takes place at the air conditioning evaporator; the evaporator is chilled as the refrigerant passes through, cooling the airflow through the evaporator for delivery to the vents. The conversion is usually accomplished by a sudden change in the tubing size. Many vehicles have a removable controlled orifice in one of the AC pipes at the firewall. The models covered use an A/C Expansion Valve or TXV that accomplishes the same purpose as a controlled orifice. To remove the A/C Expansion Valve, have the air conditioning system discharged by a licensed air conditioning technician, then disconnect the refrigerant lines from the A/C Expansion Valve at the firewall, remove the two bolts securing the valve, then remove the valve.

The models covered use a thermostatic expansion valve (TXV) to accomplish the same purpose as a controlled orifice.

Air conditioning systems convert the high-pressure liquid refrigerant from the compressor to the air conditioning evaporator by a sudden change in the tubing size.