Front Cooling Unit

INSPECTION




1. INSPECT BLOWER MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, then check that the motor rotates smoothly.
If operation is not as specified, replace the blower motor. If operation is as specified, check wire harness.




2. INSPECT THERMISTOR RESISTANCE
a. Place the thermistor in cold water, and while changing the temperature of water, measure resistance at the connector and at the same time, measure temperature of water with a thermometer.




b. Compare the 2 readings on the chart.
If resistance value is not as specified, replace the thermistor.
If resistance value is as specified, check the wire harness.







3. INSPECT MAGNETIC VALVE OPERATION
Check the air passage through the valve with and without the battery positive voltage applied between terminals as shown in the chart.
If operation is not as specified, replace me magnetic valve with expansion valve.
If operation is as specified, check the wire harness.

4. INSPECT EVAPORATOR
a. Check the evaporator fins for blockage.
If the fins are clogged, clean them with compressed air.

NOTE: Never use water to clean the evaporator.

b. Check the fitting for cracks or scratches.
If necessary repair or replace.





5. INSPECT FOR LEAKAGE OF REFRIGERANT
a. Remove the glove compartment door.
b. Remove the lower No.2 finish panel.
c. Remove the No.1 cooler cover.
1. Disconnect the connector clamp.
2. Remove the 8 screws and No.1 cooler cover.




d. Using a gas leak detector, check for leakage of refrigerant.
If there is leakage of refrigerant, check the tightening torque at the joints or check the evaporator.
e. Install the No.1 cooler cover.

6. INSPECT EXPANSION VALVE
a. Check quantity of gas during refrigeration cycle.
b. Set on manifold gauge set.
c. Operate A/C system at "MAX. COOL" for approx. 5 minutes.
d. Check expansion valve.
Check the low pressure reading will drop to 0 kPa (0 kg/sq.cm, 0 psi).

If the low pressure reading is not as specified, replace the expansion valve with the tubes.