After going through the engine block, the coolant arrives at the vehicle’s thermostat. The thermostat is managed either by a computer system or by wax held within the cylindrical tube of the thermostat. When the coolant first reaches the thermostat, it is likely closed, since it has not reached a high enough temperature. With the thermostat closed, the coolant is looped automatically back to the water pump of the engine cooling system and cycles through the engine block and back to the thermostat. But, if the coolant is hot enough, the wax will melt within the cylinder, or the computer system will send out a signal to the valve, and the thermostat valve will open, permitting coolant into the radiator to be cooled down.
Napa Service Assistant
You don’t have to be an expert to know that preventive maintenance is the best way to make sure your vehicle is running properly. Use our interactive vehicle tool to learn about the maintenance and services your NAPA AutoCare Center can provide.