What to know about the Washer Fluid Level Switch:
Many vehicles are furnished with a washer fluid level switch or sensor that illuminates a light on the dash when the fluid is low in the washer fluid reservoir. The switch is situated at the bottom of the washer fluid reservoir and is a simple resistance switch. When the sensor no longer recognizes the precise electrical resistance because there isn’t washer fluid touching the sensor, it sends a signal for the low washer fluid level warning to illuminate. To stop the warning from coming on when the washer fluid is sloshing in the reservoir, there is typically a one minute delay before the warning illuminates. If the washer fluid level switch is not functioning as it should, the low washer fluid level warning will not light up before the reservoir is empty or will be illuminated all the time, even with a full reservoir.
Facts to Note:
If you run straight water in your reservoir, the developing mold can harm the switch, pump motor, lines, and nozzles.
The washer fluid level switch can be spoiled by frozen fluids in the reservoir.
How to Fix:
The defective washer fluid level switch is found and identified
The washer fluid tank is drained and the washer fluid level switch is removed
The new washer fluid level switch is fixed and connected
The washer fluid tank is filled and checked for leaks
The washer system is tested for correct operation
The washer fluid level switch does not need upkeep, though you should make sure the correct fluid is used depending on the ambient temperature to prevent fluid from freezing. If you experience symptoms of a washer fluid level switch failure, have one of your expert mechanics examine and change it.
Common symptoms indicating you may need to change the Washer Fluid Level Switch:
Washer fluid reservoir runs empty without the low fluid indicator illuminating
Low washer fluid indicator is on even with a full washer fluid reservoir
Importance of this service:
The most damaging effect a defective washer fluid level switch can have is that you may run out of washer fluid unexpectedly. Not all vehicles are furnished with a washer fluid level switch, so it is categorized as a convenience feature. Have the switch changed at your convenience.