MTC-18
REFRIGERATION SYSTEM
Revision: January 2005 2004 Quest
REFRIGERATION SYSTEM PFP:KA990
Refrigerant Cycle EJS001RX
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the front and resar evaporators, and back to the compressor. The refrigerant evaporation through the
evaporator coils are controlled by a front and rear externally equalized expansion valves, located inside the
front and rear evaporator cases.
Refrigerant System Protection EJS001RY
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM deenergizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
2
, 398 psi), or below
about 120 kPa (1.22 kg/cm
2
, 17.4 psi).
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