Symptoms of a Bad or Failing Low Water Sensor

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Cost of Replacing a Bad or Failing Low Water Sensor

If your car has low coolant without a warning, the Coolant Light comes on for no reason, or the car is overheating, replace the low water sensor. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Low Water Sensor Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2004 Ford Explorer Sport Trac $269 $199.14 $70.00 12% $306.64
2008 Nissan Pathfinder $269 $199.14 $70.00 12% $306.64
2012 Honda Insight $158 $87.81 $70.00 19% $195.31
2011 BMW 335i $92 $21.53 $70.00 29% $129.03
2012 Cadillac CTS $158 $87.81 $70.00 19% $195.31
2008 Dodge Viper $130 $59.98 $70.00 22% $167.48
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How to Diagnose a Bad or Failing Low Water Sensor?

water sensor

Low water sensors are more commonly known, or referred to, as coolant level sensors. The purpose of these sensors is to alert the driver of low coolant level in the engine cooling system. When coolant level in the engine is low, the cooling system cannot adequately remove excess heat from the engine. This causes the engine to overheat which will lead to eventual engine failure. The most common results of engine overheating include warped or cracked cylinder heads, and blown head gaskets.

Normal operation

The typical coolant level sensor has two probes that, when inserted into engine coolant, pass electricity between them. This creates a complete electrical circuit. When coolant level falls below the probes, the circuit is broken and the low coolant level warning lamp is illuminated. This alerts the driver to have the cooling system checked.

There are basically two symptoms of a failed coolant level sensor.

Low Coolant Warning Light always on

Since the Low Coolant Warning Light is illuminated when the lamp circuit is electrically open, the sensor could go open internally regardless of actual coolant level. This would cause the coolant light to always be on. The necessary repair here would be to replace the sensor.

Low Coolant Warning Light does not illuminate on low level

If the coolant level sensor is electrically shorted internally, the coolant level circuit will never go open when coolant level falls too low. This prevents the Coolant Level Warning Light from illuminating and alerting the driver to a potentially hazardous situation. If the cooling system isn’t checked on a regular basis, engine damage may occur.

Have a trained technician like those at YourMechanic diagnose the condition. If the sensor needs replacement, they can do that. If another issue is the cause, they can fix that, too.

coolant
Sensors
overheating

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