Symptoms of a Bad or Failing Low Water Sensor

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Average rating from 12 customers who received a Coolant Level Sensor Replacement.

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.


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Recent Coolant Level Sensor Replacement reviews

Excellent Rating


YourMechanic Coolant Level Sensor Replacement Service

Average Rating

4.3/5

Number of Reviews

12

Rating Summary
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James

28 years of experience
574 reviews
James
28 years of experience
Jaguar XJ8 - Coolant Level Sensor - Kissimmee, Florida
This is the second time we have used James and he did a great job again. Very professional, personable and experienced. I highly recommend James and YourMechanic.

Marcus

6 years of experience
65 reviews
Marcus
6 years of experience
Hummer H3 - Coolant Level Sensor - Waldorf, Maryland
Showed up early great service!

Peter

41 years of experience
1251 reviews
Peter
41 years of experience
Volvo XC90 - Coolant Level Sensor - Phoenix, Arizona
He was early and worked very quickly. Answered all my concerns. He was very friendly to my two boys who were very interested to see what he was doing under the hood.

Armen

21 years of experience
7 reviews
Armen
21 years of experience
Volvo S60 - Coolant Level Sensor - Reseda, California
Armen arrived as scheduled and was very nice. He worked quickly and thoroughly and explained what he had done. I would request him again. and recommend him as well.

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