The coolant level sensor monitors the amount of coolant in your vehicle’s reservoir and alerts you if levels drop too low. If this sensor fails, you may not receive a warning when coolant is low, putting your engine at risk of overheating and severe damage. Replacing a faulty coolant level sensor restores accurate monitoring and peace of mind.

What is a coolant level sensor replacement?

Coolant level sensor replacement involves removing the faulty sensor from the coolant reservoir or radiator and fitting a new one. The new sensor ensures that your dashboard warning light or indicator works correctly, alerting you to low coolant levels before overheating occurs.

Why do you need a coolant level sensor replacement?

A working coolant level sensor ensures you know when coolant levels are too low. Without it, you may not notice a leak or fluid loss until the engine overheats, which can cause expensive damage such as a blown head gasket or warped cylinder head.

Common signs you need a coolant level sensor replacement

• Coolant warning light stays on even when levels are normal
• Coolant warning light doesn’t come on when fluid is low
• Intermittent or false dashboard alerts
• Engine overheating without prior warning
• Electrical fault codes relating to coolant monitoring

What happens during a coolant level sensor replacement?

A mechanic will:

1. Inspect the coolant level sensor and wiring for faults
2. Drain coolant if necessary to access the sensor
3. Remove the faulty sensor from the reservoir or radiator
4. Install a new sensor of the correct specification
5. Reconnect wiring and test for correct operation
6. Refill coolant and bleed the system if required

How much does a coolant level sensor replacement cost?

Coolant level sensor replacement typically costs $180–$400, depending on the vehicle make and model. Additional labour may be required if the sensor is integrated into the reservoir or radiator.

Is it unsafe to drive with a faulty coolant level sensor?

Yes. Without a working sensor, you may not know if your coolant runs low, increasing the risk of overheating and severe engine damage. It’s best to replace the sensor promptly to protect your vehicle.