Sensors Coolant Level For Volvo C 30. The Coolant Level Sensor is tested for leaks after system is filled and engine is run. NOTE: The Downloadable link is available at the end of this post.
If you do fill it to the top, it'll spill over once the water heats up and expands (and the proper coolant is toxic so you really don't want it all over your engine). Make sure the ignition is on and the heater is set to maximum heat, but do not start. I need to replace the coolant level sensor.
As the coolant heats up it expands, partially filling the expansion tank and covering the sensor.
Make sure to check your engine when it is cold for an accurate reading.
Don't fill the expansion tank to the top - there's a fill line on it. Review a complete description on our website or simply chat with us for more details. Engine coolant circulates through your engine to keep it cool in the summer but won't freeze in the winter.