KSB Electrical Solenoid Style - Inspection
Section 5 - Fuel System - Group 05
B Series Shop Manual
KSB Electrical Solenoid Style - Inspec-
Temperature switches are not interchangeable. White
smoke will be present if the wrong temperature switch
Check the part number to be sure the correct temperature
switch is used.
1) The electrical solenoid style KSB (used on 91 models
and newer) uses a 90°F [32°C] normally closed intake
manifold temperature switch, Part No. 3920598.
2) The wax motor KSB (used on pre-91 engines) uses a
160°F [71°C] normally open coolant temperature
switch, Part No. 3921642.
Although the electrical solenoid style KSB uses an intake
manifold 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 tempera-
Check the water temperature with a thermometer.
The VOM should indicate a closed circuit below 90°F
[32°C] and an open circuit above 90°F [32°C].
Replace the switch if necessary.
KSB Electrical Solenoid - Inspection
Remove the KSB electrical solenoid from the KSB housing.