The coolant supply is controlled by a thermostat. While the engine is cold, the coolant circulates only in the engine block and the heater heat exchanger. As the coolant heats up, the thermostat opens and diverts coolant flow to the radiator. The movement of the coolant is provided by a water pump driven through a V-belt. The coolant flows through the radiator from top to bottom and is cooled by oncoming air flowing around the radiator fins.
An electric fan provides additional cooling. As soon as the temperature rises above +85°C, the thermal switch turns on the fan through the relay. When the temperature drops below +80°C, the electric fan switches off again.
The expansion tank serves as a coolant reservoir. It collects the coolant that expands when heated and returns it to the cooling circuit when the engine cools. Topping up the coolant is carried out only through the expansion tank.
Warning: The radiator fan may come on even when the engine is not running and the ignition is off. Due to the formation of stagnant thermal zones, this can happen repeatedly. Therefore, when working in the engine compartment with a hot engine, you can always expect a sudden activation of the radiator fan. Therefore, whenever possible, when working in the engine compartment, always turn off the ignition.
Cooling capacity
- Engine 1.2 / 1.3 / 1.5 l - 5.0
- Engine 1.6 l turbo - 5.0
- Engine 1.6 / 1.8 l 16 klal - 6.0 l
- Engine 1.8 l diesel - 6.0