Remove the temperature switch from the intake manifold.
Caution: The switches are not interchangeable. White smoke will be present if the wrong temperature switch is
used.
Check the part number to be sure the correct temperature switch is used.
NOTE: The electrical solenoid style KSB (used on 91 models and newer) uses a 9 0 °F [32°C] normally closed intake manifold temperature switch, Part No. 3921642.
Although the electrical solenoid style KSB uses an intakemanifold temperature switch, the operation of the switch
can be checked by connecting a volt/ohm meter to the switch, placing the switch in ice water, and then heating
the water to 90°F [32°C].
Connect the VOM to the two outside pins of the temperature switch.
Check the water temperature with a thermometer.
The VOM should indicate a closed circuit below 90°F [32°C] and an open circuit above 9 0 ° F [32°C],
Replace the switch if necessary.
