The cooling system works according to the following principle. When the engine is cold, the thermostat is closed and the water pump forces water through the internal passages, bypass hose, and heater circuit back to the pump inlet. When water circulates along a small circuit, the cylinders, the surface of the combustion chambers and the valve seats are cooled. When the coolant reaches a certain temperature, the thermostat begins to open. The water is now going through the top hose to the top of the radiator. Passing through the core of the radiator, it is cooled by air passing through the radiator when the machine is moving. If necessary, the fan turns on to enhance the cooling effect.
Water returns to the water pump through the lower radiator hose and open thermostat.
The fan is controlled by a thermal switch located at the bottom of the radiator. In addition, some 4-cylinder injection engines have another thermal switch next to the fuel injectors in the cylinder head. The water temperature is measured by a sensor located in the cylinder head.
Attention: The electric fan will start working when the water in the radiator reaches (and on some models in the cylinder head) temperature, regardless of whether the ignition is on or not. Therefore, when working with a hot engine, keep an eye on that. not to get close to the fan blades.
1 - air guide
2 - nut, 10 Nm
3 - holder
4 - rubber bushing
5 - radiator
6 - sealing ring
7 - thermal switch, 25 Nm
For electric fan
8 - upper hose of the cooling system
9 - air hose
10 - rubber-metal shock absorber, 10 Nm
11 - radiator fan
12 - lower hose of the cooling system
13 - fan casing
14 - spring clips
15 - cork
Test pressure 1.2-1.5 bar
16 - expansion tank
Note: The coolant hoses are secured either with elastic bands or with screw clamps. In case of repair, the tape can be replaced with clamps. Suitable pliers are required for mounting the clamps, eg HAZET 798-5.
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