SRT-4 L4-2.4L Turbo VIN S (2004)
Expansion Valve: Description and Operation
Expansion Valve - 2.4L & RHD Models
An "H" valve-type thermal expansion valve (TXV) is used on 2.4L and RHD models. The A/C expansion valve is located at the dash panel between the
liquid and suction lines and the A/C evaporator. The A/C expansion valve consists of an aluminum H-valve body with a thermal sensor and a fitting for
the A/C low pressure switch.
High-pressure, low temperature liquid refrigerant from the liquid line passes through the expansion valve orifice, converting it into a low-pressure,
low-temperature mixture of liquid and gas before it enters the A/C evaporator. A mechanical sensor in the expansion valve control head monitors the
temperature and pressure of the refrigerant leaving the A/C evaporator through the suction line, and adjusts the orifice size at the liquid line port to let the
proper amount of refrigerant into the A/C evaporator to meet the vehicle cooling requirements. Controlling the refrigerant flow through the A/C
evaporator ensures that none of the refrigerant leaving the A/C evaporator is still in a liquid state, which could damage the A/C compressor.
The A/C expansion valve is a factory calibrated unit and cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
