Cooling Unit: Inspection

Check Evaporator Fins For Blockage
If the fins are clogged, clean them with compressed air.
Check Fitting For Cracks For Scratches
If necessary repair or replace.
Inspect Thermistor Resistance
1. Place the thermistor in cold water and while changing the temperature of the water, measure resistance it the connector and at the same time, measure temperature of the water with a thermometer.
  
  Fig 1: Inspecting Thermistor Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Compare the two readings on the chart.
  
  Fig 2: Comparing Readings Of Ohms & Temperature Relationship
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If resistance value is not as specified, replace the thermistor.