How to Test if a Thermostat is Good or Bad?
1 Answers
Check whether its performance is good and its operation is reliable. Below are the relevant methods for testing a thermostat: 1. When the coolant temperature is high, remove the rubber hose from the cylinder head leading to the upper water chamber of the radiator, plug the upper water chamber connection with a cloth or cotton yarn, fill the radiator with coolant, and then start the engine. When the coolant temperature reaches 80°C, the thermostat should be in the open state, and you will see the coolant in the radiator being pumped out through the open thermostat. The higher the engine speed, the farther the coolant is pumped. After pumping out the high-temperature coolant for a while, add more coolant to the radiator. The thermostat will close as the engine temperature decreases, and no coolant will be pumped out through the hose leading to the upper water chamber. If the engine continues to run and the coolant temperature rises above 80°C, the thermostat will open again. If the above actions are abnormal, you can remove the thermostat or replace it with a new one for testing to determine whether the original thermostat is malfunctioning. 2. Remove the thermostat from the engine, clean it, and heat it in hot water. Use a thermometer with a range of 100°C to measure the temperature. Check whether its performance is good and its operation is reliable according to the specified temperature at which the thermostat valve opens or the side valve closes.
