ML 430 (163.172) V8-4.3L (113.942) (2000)
Coolant Level Sensor: Description and Operation
The coolant level indicator electronic switch (S41) is integrated in the coolant reservoir.
Coolant level switch, task
To record the coolant level:
Coolant level In order or below minimum
Coolant level switch, design
The coolant level indicator electronic switch (S41) consists of two electrodes which are permanently cast to the coolant reservoir and a connector
with contacts which have an electrical connection to the electrodes.
Coolant level switch, function
The two electrodes are either immersed or not immersed in the coolant depending on the coolant level. As a result the test current changes via the
coolant level indicator electronic switch (S41). This change is evaluated by the instrument cluster (A1).
An alternating current is used so that the electrodes do not disintegrate.