Update your semi with an improved method of monitoring coolant levels, with the Dorman Heavy Duty Engine Coolant Level Sensor that ensures you're Ready for the Road Ahead. This replacement device works to observe the level of coolant in an engine, sending diagnostics back to the display panel to alert operators of low levels. Engineered with a robust design to withstand harsh conditions and a range of temperature variations. FleetPride is your First Click in Heavy Duty.