Electrical System 16-61 Switches and Sensors

Water Temperature Switch Inspection

• Remove the water temperature switch (see Water Tem­perature Switch Removal in the Cooling System chapter).

• Suspend the switch [A] in a container of coolant so that the temperature sensing projection and threaded portion are submerged.

• Suspend an accurate thermometer [B] in the coolant so that the sensitive portions [C] are located in almost the same depth.

NOTE

OThe switch and thermometer must not touch the con­tainer sides or bottom.

• Place the container over a source of heat and gradu­ally raise the temperature of the coolant while stirring the coolant gently.

• Using the hand tester, measure the internal resistance of the switch across the terminal and the body at the tem­peratures shown in the table.

• If the hand tester does not show the specified values, re­place the switch.

Water Temperature Switch Connections Rising temperature:

From OFF to ON at 113 ~ 117°C (235 ~ 243°F)

Falling temperature:

From ON to OFF at 108°C (226°F) temperature less than ON temperature