Locate Ford Focus Thermostat Gauge. Order Ford Focus Bleeder Valve Coolant System & Ford Focus Coolant Thermostat Price Replace Ford Focus Thermostats. Maintaining your Ford Focus's thermostat is crucial for optimal engine performance, as it regulates the coolant flow and maintains proper operating temperature. To extend its lifespan, ensure the cooling system is flushed regularly and coolant levels are routinely checked. Be alert for signs of thermostat failure, such as engine overheating or fluctuating temperatures, which signal the need for a replacement. When choosing a replacement, opt for high-quality materials like stainless steel for durability. For installation ease, select thermostats with a precise fit specific to your Focus model, and consider those with advanced features like jiggle pins for air release, which promote longevity and efficiency.