Open (Cooler Mode)

When coolant temperature is 108°C (226.4°F) or more, the ball rotary valve opens fully, allowing the maximum amount of coolant to flow to the radiator.

When coolant temperature is 85°C (185°F) or more under the full load request condition, ECM fully opens the ball rotary valve by controlling the thermostat heater element to heat the wax element. Accordingly, the maximum amount of coolant flows to the radiator.

Under the following conditions, coolant temperature is adjusted to prevent it from reaching the hazardous temperature range.

• Intake air temperature: 38°C (100.4°F)
• Engine speeds: 3000 RPM or more
• Engine load: 30%

ECM circulates coolant to the radiator to lower the coolant temperature by controlling the coolant thermostat heater element and opening the ball rotary valve according to ambient temperature. When ambient temperature is less than 12°C, ECM adjusts coolant temperature at approximately 90°C (194°F). When ambient temperature is 12°C (53.6°F) or more, ECM adjust coolant temperature at approximately 80°C (176°F).