Windstar V6-232 3.8L (1995)
Expansion Valve: Description and Operation
Thermostatic Expansion Valve
The thermostatic expansion valve TXV controls admission of refrigerant to the evaporator for maximum cooling. It consists of a diaphragm, a valve in
the refrigerant line, and a capillary tube filled with a liquid which expands and contracts with temperature changes.
The capillary tube is attached to the A / C evaporator core (19860) to sense evaporator core temperature. When the A / C evaporator core is relatively
warm, the liquid in the capillary tube expands, pressing on the diaphragm, opening the attached valve and allowing more refrigerant to enter. When the
A/C evaporator core cools, the liquid in the capillary tube contracts allowing a spring to partially or fully close the valve restricting the admission of
refrigerant to the A/C evaporator core.
Allowing additional refrigerant to the A / C evaporator core cools it further. Restricting the flow of refrigerant reduces the cooling of the A/C
evaporator core.