Durango 2WD V8-4.7L Flex Fuel (2009)
Expansion Valve: Description and Operation
A/C Expansion Valve - Operation
Front
OPERATION
The A/C expansion valve controls the flow of high-pressure, low temperature liquid refrigerant entering the expansion valve and converts it into a
low-pressure, low-temperature mixture of liquid and gas before it enters the A/C evaporator. To meet the vehicles A/C cooling requirements, a
mechanical sensor is used in the A/C expansion valve to monitor the temperature and pressure of the refrigerant leaving the A/C evaporator and then
adjust the inlet port orifice size to allow only the proper amount of refrigerant to enter the evaporator. Controlling the refrigerant flow through the A/C
evaporator ensures that none of the refrigerant leaving the evaporator is still in a liquid state, which could damage the A/C compressor.
NOTE: Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line or expansion valve is disconnected.
Failure to replace the rubber O-ring seals and metal gaskets could result in a refrigerant system leak.
The A/C expansion valve is factory calibrated and cannot be adjusted or repaired and must be replaced if inoperative or damaged.
Rear
OPERATION
The rear A/C expansion valve controls the flow of high-pressure, low temperature liquid refrigerant entering the expansion valve and converts it into a
low-pressure, low-temperature mixture of liquid and gas before it enters the rear A/C evaporator. To meet the vehicles A/C cooling requirements, a
mechanical sensor is used in the rear A/C expansion valve to monitor the temperature and pressure of the refrigerant leaving the rear A/C evaporator and
then adjust the inlet port orifice size to allow only the proper amount of refrigerant to enter the evaporator. Controlling the refrigerant flow through the
rear A/C evaporator ensures that none of the refrigerant leaving the evaporator is still in a liquid state, which could damage the A/C compressor.
NOTE: Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line or expansion valve is disconnected.
Failure to replace the rubber O-ring seals and metal gaskets may result in a refrigerant system leak.
The rear A/C expansion valve is factory calibrated and cannot be adjusted or repaired and must be replaced if inoperative or damaged