The failed thermostat is removed and a new one is installed in its place, noting the exact orientation of the old part.The thermostat housing is unbolted from the engine.The cooling system is drained and the technician locates the thermostat, typically on the engine by the upper radiator hose.How is a thermostat replacement performed? The Check Engine light illuminates for coolant temperature codes.The temperature gauge spikes to full hot while running, and your engine overheats.No heat coming through your dash vents.Your engine doesn’t get up to operating temperature.Symptoms that a thermostat replacement is required This cycle repeats over and over again until the engine is shut down and cools off. It prevents engine coolant from flowing through the coolant hoses to the radiator, keeping coolant inside the engine until it warms up.Īs the engine temperature increases to the thermostat’s operating temperature, a small charge of wax inside the valve expands and opens the valve, and the water pump can circulate the engine’s coolant throughout the cooling systemĪs the heat dissipates, the wax contracts and the valve closes. When the thermostat is below operating temperature, a spring keeps it closed. You can expect thermostat replacement to be between $150 and $250 for most vehicles, although some are exponentially more due to vehicle design.Ī thermostat is a small, mechanical valve inside the cooling system. Over time and by constantly opening and closing during operation, the thermostat can become weak, get stuck open or closed, or become restricted by corrosion buildup. Your engine thermostat also restricts coolant flow on warmup to create heat inside your car sooner, and to get the engine into the best operating range for proper emissions. You might think your engine thermostat’s only purpose is to prevent overheating, but that’s not all it does. How much does a thermostat replacement cost?
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