![]() When this happens, the coolant is able to flow freely to the radiator. If the opposite were true from the above complaint, the thermostat would be stuck open. Still, the thermostat should be one of the parts you examine. Additionally, the radiator could become clogged. It could also be due to a bad water pump or a cooling system leak. You want to check the coolant levels to ensure you have enough fluid in the system. However, an overheating engine isn’t always caused by a bad thermostat. For example, if you end up with a blown head gasket, you are looking at massive repair bills. If the engine overheats, it can cause serious damage. However, with the stuck thermostat, the coolant remains stagnant, continuing to build up more heat. Once this occurs, it comes back to the engine and dissipates more of the heat. Because the hot fluid cannot be cooled down, it keeps the temperature of the engine up higher than normal.Ĭoolant needs to make its way to the radiator to be cooled down. Finally, the engine is checked for leaks.When the car thermostat remains stuck closed, the hot coolant cannot flow to the radiator. This will confirm the thermostat is open. The car engine is run until the normal operating temperature is reached, and while taking precautions with the hot coolant, the coolant level is rechecked while confirming there is flow through the radiator - either visually or with an infrared temperature gun.The cooling system is refilled with the appropriate coolant type and the system is fully bled of all air.The thermostat housing bolts are tightened to original equipment manufacturer (OEM) specifications using a calibrated inch-pound torque wrench.A new gasket is applied and the thermostat is re-installed in the correct orientation and with the temperature sensing cylinder facing downward towards the engine. All mounting surfaces on the thermostat housing are cleaned of old gasket material.Note that some cars have more than one cooling system thermostat and both might need replacement. ![]() The thermostat housing is removed and the thermostat and gasket are extracted.Once the engine is completely cold, the radiator cap is loosened and enough coolant is drained from the radiator so the coolant level is below the thermostat housing.How do mechanics replace the engine cooling system thermostat? Therefore, if the cooling system is already open for major repairs, such as water pump or radiator replacement, it is recommended to install a new thermostat simply as insurance against future breakdown. Your dash-mounted temperature gauge will notify you of this malfunction. Thermostats can get sticky, causing the engine temperature to stray from the optimal range. Temperature gauge reads too low or too high.If so, it would be repaired prior to replacing the thermostat. Since it is usually not known how badly the engine overheated, the mechanic will also try to determine if there is evidence that the cylinder head gasket was blown. However, since there are other causes of overheating, a mechanic will thoroughly inspect the cooling system prior to condemning the thermostat. A thermostat with the valve stuck closed is a common cause of engine overheating. When to consider replacing the engine cooling system thermostat: 1987 Chrysler Town & Country L4-2.2L Turboġ985 Chrysler Town & Country L4-2.2L Turbo
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