On-Vehicle Inspection

COOLING UNIT

ON-VEHICLE INSPECTION




1. REMOVE GLOVE COMPARTMENT DOOR

2. INSPECT FOR LEAKAGE OF REFRIGERANT
a. Remove the nut, screw and No.1 instrument panel lower bracket.




b. Remove the blower resistor.
1. Disconnect the blower resistor connector.
2. Remove the 2 screws and blower resistor.

c. Inspect for the leakage of refrigerant, using a gas leak detector.
If there is leakage, check the tightening torque at the joints or check the evaporator.

d. Reinstall the blower resistor with the 2 screws.
e. Reconnect the blower resistor connector.
f. Reinstall the No.1 instrument panel lower bracket with the nut and screw.

3. INSPECT EXPANSION VALVE
a. Check the quantity of gas during refrigeration cycle.
b. Set on the manifold gauge set.
c. Run the engine.
1. Run the engine at 1,500 rpm for at least 5 minutes.
2. Then check that the high pressure reading is 1.37 - 1.57 MPa (14 - 16 kgf/sq.cm, 199 - 228 psi).

d. Check the expansion valve.
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/sq.cm, 0 psi).

HINT: When the low pressure drops to 0 kPa (0 kgf/sq.cm, 0 psi), feel the receiver's IN and OUT sides for zero temperature difference.




4. INSPECT THERMISTOR RESISTANCE
a. Disconnect the thermistor connector.
b. Using an ohmmeter, measure the resistance between the terminals.

Standard resistance: 1,700 ohms at 25 °C (77 °F)

If resistance is not as specified, replace the thermistor.

5. REINSTALL GLOVE COMPARTMENT DOOR