400E (124.034) V8-4.2L (119.975) (1992)
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Coolant Level Indicator Lamp: Description and Operation
General
The coolant level indicator monitors the coolant level in the expansion reservoir (1) when the engine is running.
When the ignition is switched on, the indicator lamp (A1e11) lights up weakly (check function) and goes out as soon as the engine is started
provided the coolant is at correct level
The coolant level sensor (S41) has two retaining lugs of different width and can be installed only in one position. It is sealed by means of an
O-ring (62) and fixed in position by a circlip (55).
Function
If the coolant is at the correct level a permanent magnet (2) in the float (51) and a permanent magnet (3) in the sensor (S41) hold a contact (arrow)
open.
It the coolant level is too low the float (51) moves down and the permanent magnet (3) closes the contact (arrow) in the coolant level sensor (S41).
A permanent input signal (vehicle ground) exists at the base plate (a) of the instrument panel unit (A1) and the indicator lamp (A1e11) lights up
brightly.
