Coolant Level Sensor Compatible with Opel Astra H/Zafira B

A "coolant expansion tank sensor," also called a "coolant level sensor," is a component in a car's cooling system that monitors the level of coolant fluid within the expansion tank, essentially detecting whether the coolant is at an appropriate level and alerting the driver if it becomes too low, potentially preventing engine damage from overheating.

Key points about a coolant expansion tank sensor:

Function: It measures the coolant level by detecting the presence or absence of fluid in the expansion tank.

Location: Usually found within the expansion tank itself or mounted on its side.
Signal output: Sends a signal to the car's computer when the coolant level drops below a certain threshold, which can trigger a warning light on the dashboard.

Important distinction:
Coolant temperature sensor vs. level sensor: While both are part of the cooling system, the coolant temperature sensor measures the actual temperature of the coolant, not its level.

What's in the box
1 x Sensor