Cooling Unit: Inspection

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Check evaporator fins for blockage.
1. If the fins are clogged, clean them with compressed air.
Check fitting for cracks for scratches.
1. 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 at the connector and at the same time, measure temperature of the water with a thermometer.
  
  Fig 1: Displaying Thermometer In Ice Water
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Compare the 2 readings on the chart.
  
  Fig 2: Displaying Resistance Values Based On Temperature
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If resistance value is not as specified, replace the thermistor.