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A stuck open thermostat can significantly impact your car's fuel economy. Here's how: Engine runs too cool: A thermostat is responsible for regulating the engine's temperature by controlling the flow of coolant. If the thermostat is stuck open, the coolant continuously flows through the engine, causing the engine to run cooler than intended.
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Like the thermostat in your house, the thermostat in your car is responsible for maintaining the temperature of your engine. It does this by controlling the flow of coolant that goes through your engine and then back through the radiator. When your thermostat is working properly it opens and closes as required to either let coolant flow or stop the flow of coolant depending on what temperature.
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Car Thermostat Overview. A car's thermostat regulates the flow of coolant through the engine and is an essential part in the operation of your vehicle. In most cases, an overheating or no-heat condition in your vehicle is due to a faulty thermostat. And since the T-stat price is only about $8, it makes more sense to replace it than to spend hours diagnosing the problem.
Thermostat Stuck Open Symptoms
A stuck open thermostat can cause poor engine performance and acceleration. This is because the engine is not heating up to its optimal temperature, which can lead to sluggish performance and a lack of power. Engine Misfires. If you notice your engine misfiring or stuttering, it could be a sign of a stuck open thermostat. This happens because.
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Look for the thermostat on the wall. Unscrew the radiator cap and remove it from the radiator. Have another person start the car for you. The engine temperature dips below normal when the thermostat is stuck open while driving, especially on the highway in cold weather. A stuck-open thermostat can also cause a lack of heat from the heating system.
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Thermostat stuck open: When the thermostat is stuck open, the engine temperature drops below normal when driving, especially on the highway in cold weather. A stuck-open thermostat can also cause a lack of heat from the heating system. The Check Engine light may come on too.
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4. Defective Thermostat. Yes, you can drive with a thermostat stuck open and do so indefinitely. That's because a stuck-open thermostat will cause an overcooling condition that prevents the engine from running optimally. The engine won't suffer immediate damage like if the thermostat was stuck closed.
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Low Engine Temperature. If your car is running unusually cool and not building up any heat in the engine, it's likely that your thermostat is stuck open and is letting too much coolant through. A thermostat that is stuck in the closed position will cause your vehicle to overheat. Most drivers know when the vehicle's engine temperature gauge.
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A malfunctioning thermostat can cause poor fuel efficiency. A cold engine needs a higher amount of fuel to function correctly, but if the thermostat is stuck open or closed, the amount of fuel may fluctuate, causing poor mileage. This can also cause uneven engine performance, misfiring, and poor acceleration.
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Removing and Testing the Thermostat. If you are still unsure whether the thermostat is stuck, perform the following procedure to get an accurate diagnosis. Disconnect the negative battery cable. Drain some of the coolant (a gallon should be enough) so the fluid won't pour out when you perform the next step.
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Weak spring: A spring allows a thermostat to open and shut properly. A spring of inferior quality will deteriorate earlier and fail to close the thermostat. The thermostat, therefore, stays fixed in the open position. Contaminated Fluids: The thermostat serves as a passageway for coolant as it passes through the cooling system.
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Plug it into the OBD-II port and run a scan to see what the problem is. If the cause is the thermostat, replacement is the solution. The relative ease and inexpense of this repair goes out the window if you ignore the signs of a stuck-closed thermostat, though. If your engine starts to overheat, immediately pull off the road, shut off your car.
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If they are the same, then the thermostat is stuck in the open position. Take the temperature of the lower radiator hose as well. If there's an imbalance between them, it's probably a sign that your car's thermostat is closed. 4. Measure the temperatures again after 10-15 minutes.
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Once this temperature is reached, the thermostat opens and allows coolant to pass through the radiator, hoses and engine to cool it off. The Heat Is On. Thermostats fail because they become weak, stuck open or stuck closed. When a thermostat is stuck open, coolant constantly circulates and the engine takes longer to reach operating temperature.
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Here are 5 symptoms you can look for to know if your thermostat is stuck open: 1. Check Engine Light and Fault Codes. One of the first signs you'll see that your thermostat is stuck open is your Check Engine light turning on. But, of course, that light can turn on for a long list of very different reasons, so there's no way to know that it.