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ENGINE FUEL SYSTEM
COMPONENT TESTING
THERMO· TIME COOLANT SWITCH TESTS
FIRST TEST PROCEDURE
WARNING
Do not loosen the coolant switch with the system
hot and pressurized because serious burns from
coolant can result.
Remove the thermo-time
coolant switch from the
cylinder head and replace it with a plug to prevent
loss of coolant.
Cool the thermo-time coolant switch by immersing it
in cold water.
• connect the switch connector pin W to either of
the test lamp wires
• connect the other test lamp wire to the positive
(+)
terminal of the battery
• connect a wire from the negative (-) terminal of
the battery to the body of the thermo-time
coolant switch
·'r-li
i·
The_lamp should light.
Place the thermo-time
coolant
switch (L) in a
container
of water
and heat the water
while
monitoring its temperature.
The lamp should go out between 30° and 40°C (86°
and 104°F).
The nominal values of the thermo-time
coolant
switch are marked on the six sides of the body.
For example: 35°C/8s (8 secl35°C).
C3-1
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Troubleshooting
