Cooling system components
Water pump. A centrifugal water pump circulates coolant through the cooling system
Radiator. All models are made of light metal. The radiator consists of two tanks connected to each other by a multitude of thin-walled tubes. To increase the cooling surface, accordion-folded plates are inserted between the tubes, which collect excess heat and give it to the oncoming air flow. The radiator is mounted on the upper and lower crossbars.
Thermostat. This temperature-dependent controller controls the coolant circulation circuits.
[Article based on data from the website: MercedesMAN]
At temperatures up to +85°C, the valve on the thermostat closes access to the radiator, and the coolant circulates in a closed circuit (engine).
At temperatures between +85 and +100°C, the thermostat partially opens the coolant passage to the radiator. The passage to the water pump remains more or less open. The cold liquid from the radiator gradually mixes with the warm coolant before entering the engine.
The thermostat valve is fully open at temperatures above 100°C, at which point all coolant passes through the radiator.
Expansion tank. The required amount of coolant circulating in the cooling system is added to it. The excess pressure created in the expansion tank is equalized by the pressure reducing valve located in the tank cap.
Radiator fan. Designed for more efficient cooling of the radiator with air. Depending on the engine type and vehicle configuration, a fan with a viscous coupling or an electric fan is installed.