In this video, you will see the complete process of locating and replacing the engine thermostat and its plastic housing assembly on a Ford Taurus equipped with the 2.0L EcoBoost turbo engine. If your car takes forever to warm up in the winter, throws a check engine light for a cooling performance code, or is actively overheating into the red zone, this visual guide shows you exactly where to look under the hood to find the thermostat and how to swap it out.
How this video helps you: The thermostat on the 2.0L EcoBoost engine is integrated into a black plastic water outlet housing. It is located on the lower front-passenger side of the engine block, tucked underneath the intake manifold, throttle body, and behind the alternator assembly. Because it is buried beneath turbo charge pipes, rigid cooling lines, and main wiring harnesses, it is entirely hidden from a standard top-down look. This video points directly to its exact location on the vehicle so you can see it clearly. You will see how to drop the lower splash shields for access from below, how to safely release the spring-loaded hose clamps without slicing the rubber cooling hoses, and the best way to unbolt the plastic housing without cracking it or stripping the threads in the engine block.
⚠️ CRITICAL SAFETY NOTE: Never attempt to open the cooling system or remove the thermostat housing while the engine is hot! The system operates under high pressure, and scalding hot antifreeze can spray out violently, causing severe burns. Always let the vehicle sit and cool down completely for at least a few hours before starting this repair. Have a wide drain pan positioned directly underneath, as a large amount of engine coolant will pour out of the block the moment the housing is loosened.
Common symptoms of a bad Engine Thermostat: The thermostat controls the flow of coolant between the engine block and the radiator to maintain an optimal operating temperature. When the internal spring mechanism fails or the plastic housing warps, it causes these classic issues:
- Engine Overheating: If the thermostat sticks in the closed position, coolant cannot reach the radiator to cool down. Your dashboard temperature gauge will rapidly spike into the hot zone, risking severe engine damage.
- Engine Running Too Cold & Slow Warm-Up: If the thermostat sticks open, coolant constantly cycles through the radiator even when the car is freezing. The engine will struggle to warm up, your cabin heater will blow weak, lukewarm air, and your fuel efficiency will drop.
- Check Engine Light & Code P0128: The vehicle’s computer monitors how fast the engine heats up. If it stays cold for too long, it will trip the engine light and store code P0128 (Coolant Thermostat Temperature Below Regulating Temperature).
- Coolant Leaks Around the Housing: The factory plastic thermostat housing is a notorious leak point. Over time, constant engine heat cycles cause the plastic body to warp or crack, or degrade its internal rubber seal, leading to a steady antifreeze puddle dripping down onto the passenger side frame rail.
Watch the video to see the exact tool setup, bolt layout, and bleeding procedure to get your cooling system running at the perfect temperature!