Rear Cooling Unit: Inspection

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT BLOWER MOTOR
1. Connect battery positive (+) lead to terminal 1 and battery negative (-) lead to terminal 2, then check that the motor rotates smoothly.
  If the motor rotates smoothly, check the wire harness, otherwise, replace the blower motor.
  
  Fig 1: Connecting Battery Positive (+) Lead To Terminal 1 & Battery Negative (-) Lead To Terminal 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT THERMISTOR
1. Place the thermistor in cold water.
2. Measure resistance of the thermistor as the water temperature increases.
  
  Fig 2: Measuring Resistance Of Thermistor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Compare the readings with Fig 3 .
  If the values meet the specifications, check the wire harness. Otherwise, replace the thermistor.
  
  Fig 3: Thermistor Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT EXPANSION VALVE

Check the air passage through the valve, with and without the battery positive voltage applied, between terminals as shown in BATTERY POSITIVE VOLTAGE REFERENCE .

BATTERY POSITIVE VOLTAGE REFERENCE

Condition	Air passage
Apply B+ between terminals	Free passage
Not apply B+ between terminals	No passage

If operation is as specified, check the wire harness. Otherwise, replace the magnetic valve with the expansion valve.

Fig 4: Inspecting Expansion Valve