Inspection Procedure
1. CHECK EVAPORATOR FINS FOR BLOCKAGEIf the fins are clogged, clean them with compressed air.
NOTE: Never use water to clean the evaporator.
2. CHECK FITTINGS FOR CRACKS OR SCRATCHES
3. INSPECT THERMISTOR RESISTANCE
a. Place the thermistor in cold water, and while changing the temperature of the water, measure resistance at the connector and at the same time, measure temperature of the water with a thermometer.
b. Compare the 2 readings on the chart.
If resistance value is not as specified, replace the thermistor.