System Description: Close
The ball rotary valve is closed under the following conditions.
- Engine coolant temperature: 95°C (203°F) or less
- Coolant thermostat heater element: No power distribution
- No full load request
In the closed position, coolant circulates in the engine. Coolant flows to the heater core, if necessary, but not to radiator. This increases coolant temperature rapidly and accelerates warm-up, improving fuel economy and reducing toxic exhaust gas.
| Coolant thermostat housing | |
| Wax element | |
| Coolant thermostat heater element | |
| Ball rotary valve | |
| A | From engine |
| B | To radiator |
| C | To heater heat exchanger |