This screw is used to fine-tune the temperature control of your vehicle's engine. It allows you to adjust the temperature at which the thermostat opens, allowing coolant to flow through the engine. This can be helpful in extreme weather conditions, or if you have made modifications to your engine that affect its cooling system.
To adjust the thermostat housing adjustment screw, you will need a screwdriver or wrench. Turn the screw clockwise to increase the temperature at which the thermostat opens, or counterclockwise to decrease the temperature at which the thermostat opens. Be sure to make small adjustments at a time, and test the system after each adjustment to make sure that it is working properly.
