SSANGYONG REXTON 2006.09 Manual page 447

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7) Expansion Valve
The expansion valve can fall in three different positions: open, closed or restricted.
An expansion valve that fails in open position will result in a noisy A/C compressor or no
cooling. The cause can be a broken spring, a broken ball or excessive moisture in the A/C
system. If the spring or the ball are found to be defective, replace the expansion valve. If
excessive moisture is found in the A/C system recycle the refrigerant. A restricted expansion
valve will result in low suction pressure and no cooling. This may be caused by debris in the
refrigerant system. If debris is believed to be the cause, recycle the refrigerant, replace the
expansion valve and replace the receiver-drier.
8) Evaporator
The evaporator is a device which cools and dehumidifies the air before it enters the vehicle.
High pressure liquid refrigerant flows through the expansion tube (orifice) and becomes a low
pressure gas in the evaporator. The heat in the air passing through the evaporator core is
transferred to the cooler surface or the core, which cools the air. As the process of heat transfer
from the air the evaporator core surface is taking place, any moisture (humidity) in the air
condenses on the outside surface of the evaporator core and is drained off as water.
9) Pressure Relief Valve
The compressor is equipped with a pressure relies valve which is placed in the system as a
safety factor. Under certain conditions, the refrigerant on the discharge side may exceed the
designed operating pressure at approximately at 3,171 to 4,137 kPa (460 to 600 psi) in an R-
134a system. Conditions that might cause this valve to open, such as a defective pressure
transducer, an inoperative cooling fan, etc., should be corrected. The refrigerant oil and the
refrigerant should be replaced as necessary.
10) Controller
The operation of the A/C system is controlled by the switches and knob on the control head.
This consolemounted controller contains following control knobs.
Temperature control
- Actuates by cable.
- Raise the temperature of the air entering the vehicle by sliding to the right or the red
portion of the knob.
- Varies the mix of the fresh air from outside the vehicle with the heated air from inside the
vehicle to suit individual performance.
AIR CONDITIONER
REXTON 2006.09