Coolant Level Sensor: Description and Operation

General
Coolant does not flow directly around the coolant level sensor (S41) and the sensor can be removed and installed without draining the coolant in the expansion reservoir (1).

Operation
If the coolant level is too low, the ring magnet (54) in the float (1) closes the contact (arrow) in the coolant level sensor (S41). A permanent input signal (vehicle ground) exists at microprocessor (a) in the electrical base plate of the instrument panel unit (A1) and the warning light (A1e11) comes on with a bright light.

Test Specifications
Resistance At Coolant Level Sensor:
Maximum Coolant Level: infinity/open
Minimum Coolant Level: approximately 5 ohms
Battery Voltage: 12 volts