Dodge Journey: Description, Operation
DESCRIPTION
Fig. 265: A/C Expansion Valve Description KA
The A/C expansion valve controls the amount of refrigerant entering the A/C evaporator. The A/C expansion valve is of a thermostatic expansion valve (TXV) design and consists of an aluminum H-valve type body (1) with an inlet port (2), outlet port (3) and an integral thermal sensor (4).
The A/C expansion valve is located in the engine compartment at the dash panel, between the A/C refrigerant lines and the A/C evaporator.
OPERATION
The A/C expansion valve controls the high-pressure, low temperature liquid refrigerant from the A/C liquid line and converts it into a low-pressure, low-temperature mixture of liquid and gas before it enters the A/C evaporator. A mechanical sensor in the A/C expansion valve monitors the temperature and pressure of the refrigerant leaving the A/C evaporator through the A/C suction line, and adjusts the orifice size at the liquid line port to let the proper amount of refrigerant into the evaporator to meet the vehicle A/C 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.
NOTE: Replacement of the refrigerant line O-ring seals is required anytime a refrigerant line is disconnected from the expansion valve, or if the expansion valve is removed. Failure to replace the rubber O-ring seals may 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.
Diagnosis and Testing
A/C EXPANSION VALVE
WARNING: Refer to the applicable warnings and cautions for this
system before
performing the following operation. Failure to follow the warnings and
cautions may ...
See also:
Relay, trailer tow
DESCRIPTION
Fig. 40: Identifying Relay & Terminals
Vehicles equipped with an optional trailer tow preparation package have four
trailer tow relays, one each for the
trailer tow stop/turn ri ...
Crossmember, front suspension
REMOVAL
1. Raise and support the vehicle.
Fig. 33: Tire And Wheel Mounting
2. On each side of the vehicle, remove the wheel mounting nuts (3), then the
front tire and wheel assembly
(1).
Fi ...
Communication
DESCRIPTION
The primary on-board communication network between microprocessor-based
electronic control modules in
this vehicle is the Controller Area Network (CAN) data bus system. A data bus
ne ...