A car's engine thermostat is the component in its cooling system that opens and allows coolant to circulate once the motor is warmed up. This gives two main benefits: 1) It allows the engine to heat up to its optimum temperature as quickly as possible. 2) it keep the engine at its optimum temperature while running. 🎗 Share, Comment, and save for more people to see. Thanks for your Support! #internal #combustion #engine #mechanic #coolant #thermostat #coolingsystem #test #mechanical #heat #syste