This sensor basically reads the temperature of the engine coolant – that’s the fluid that keeps your engine from overheating. It sends that temperature reading to the car’s computer. That computer then uses that information to adjust things like fuel mixture, ignition timing, and even how the cooling fans operate. It’s a pretty crucial little component for keeping everything running smoothly. Think of it as the engine's thermometer. The computer doesn't feel temperature, it relies on this sensor to tell it what’s going on. It affects a lot more than just the heater, honestly. It impacts how efficiently your engine runs, and how well it responds. It's often located near the thermostat housing, or somewhere on the engine block where it gets a good reading of the coolant temperature. A failing sensor can cause all sorts of problems. You might notice your engine running rich, meaning it’s using too much fuel. Or maybe your check engine light will come on. Sometimes it can even cause hard starting or stalling. It acts like a shield, protecting your engine from damage caused by overheating or inefficient operation. You’ll notice if it’s failing because your fuel economy will likely drop, or the engine might feel sluggish. You can find a replacement easily enough, Fixparts Online has them in stock if you need one. Ignoring it isn't a good idea, because a bad sensor can lead to more expensive problems down the road. Why settle for less? Heater Coolant Temperature Sensor (MPN 64116968175) includes a 12-month warranty!

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