Many vehicles are equipped 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 located at the bottom of the washer fluid reservoir and is a simple resistance switch. When the sensor no longer recognizes the correct 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 prevent 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 working as it should, the low washer fluid level warning will not illuminate before the reservoir is empty or will be illuminated all the time, even with a full reservoir.
The washer fluid level switch does not require maintenance, 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 our expert mechanics inspect and replace it.
The most detrimental effect a faulty washer fluid level switch can have is that you may run out of washer fluid unexpectedly. Not all vehicles are equipped with a washer fluid level switch, so it is categorized as a convenience feature. Have the switch replaced at your convenience.
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