Air conditioning thermostatic expansion valve (TXV) — general information Ford F150
Warning: The air conditioning system is under high pressure. DO NOT loosen any hose fittings or remove any components until the system has been discharged. Air conditioning refrigerant must be properly discharged into an EPA-approved recovery/recycling unit by a dealer service department or an automotive air conditioning repair facility. Always wear eye protection when disconnecting air conditioning system fittings.
1. 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 refrigerant lines at the firewall.
The Thermostatic Expansion Valve is located on the firewall — heater hoses removed for clarity
2. The models covered by this manual use a Thermostatic Expansion Valve (TXV) that accomplishes the same thing as a controlled orifice
3. Have the air conditioning system discharged by a licensed air conditioning technician.
4. Loosen the right-front wheel lug nuts, then raise the vehicle and support it securely on jackstands. Remove the wheel.
5. Remove the right-side inner fender splash shield (see Body).
6. Remove the refrigerant manifold line bracket fastener below the battery.
7. Remove the refrigerant line manifold mounting nut, disconnect the refrigerant line manifold from the TXV at the firewall and remove the 0-rings.
8. Remove the TXV valve Allen head bolts, separate the TXV valve from the evaporator and remove the 0-rings.
9. Installation is the reverse of removal, making sure to use new 0-rings.
10. Have the system evacuated, recharged and leak tested by the shop that discharged it.