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®.