A LOCK ON THE COOLANT CIRCUITS

The engine cooling system is subdivided into a large cooling circuit and a small cooling circuit. If the engine is cold, no additional cooling is required and the thermostat disconnects the radiator from the cooling circuit. When the engine heats up, the thermostat enables access to the radiator, i.e. to the large cooling circuit. This principle allows the engine to reach its operating temperature more quickly after a cold start.

The switching temperature of a thermostat depends on the engine design and application area (desert, temperate latitudes) and is normally approx. 80° Celsius. The expansion element ensures enabling/disabling of access to the radiator.

Cool Facts

• Large range of thermostats with and without venting

• Various designs with special switching temperatures for hot or cold regions