jcb JS300 Service Manual page 538

Removal and Replacement Guide
To remove the coolant level switch, proceed as follows:
Note: There is no need to drain the coolant. Coolant will
not be lost when the coolant level switch is removed.
1 Disconnect the electrical harness connector at the
coolant level switch.
2 Using a flat blade screwdriver carefully prise the
coolant level switch from the coolant expansion
bottle. Keep the screwdriver as close to the base of
the coolant level switch as possible. Do not lever
against the moulded electrical connector. Do not use
excessive force.
When replacing the coolant level switch press the switch
into its cavity in the coolant expansion bottle. Ensure that
the switch correctly clips into place.
Test Procedures
The coolant level switch design means that the switch is
most likely to default to the open state in the event of a
faulty reed or float. This will activate the low coolant level
warnings even if the coolant level is correct.
Ensure that the float location inside the coolant expansion
bottle is correct.
Ensure that the float is free to move and that there is no
sediment in the bottom of the coolant expansion bottle.
C-113 9813/5100-1
Section C - Electrics
Engine and Power Control
Engine Coolant Level Switch
C-113