1. After draining the coolant, disconnect the upper hose from the radiator. Insert the water hose into the top connection. It is necessary to pass water through the radiator until then. until clean water flows through the bottom fitting.
2. Disconnect the stove hoses from the return pipe 15 and from the fitting 12 (pic. 2.5). Set the stove valve to maximum. Insert the water hose into the stove hose and run water through the stove until clean water comes out of the return hose.
Pic. 2.5. Cooling system - 1.6 and 1.8 liter engines
1 - radiator / water pump pipe; 2 - thermostat cover washer; 3 - thermostat; 4 - front cover with blades; 5 - gasket; 6 - input channel to the engine housing; 7 - branch pipe of the head / radiator; 8 - thermal switch; 9 - gasket; 10 - outlet fitting to the radiator; 11 - gasket: 12 - outlet fitting from the head; 13 - temperature sensor; 14 - thermal switch; 15 - return pipe from the stove; 16 - the place of connection of the branch pipe from the surge tank.
3. In case of severe contamination of the system, it is necessary to flush the pipes in the opposite direction. For this purpose, it is necessary to remove the radiator, turn it and insert the water hose into the outlet fitting 15 (pic. 2.2). It is necessary to flush the pipes until clean water flows out of the inlet fitting.
Pic. 2.2. Cooling system - 1.1 and 1.3 liter engines
1 - left cover; 2 - bolt securing the radiator; 2a - permanent fixing bracket; 3 - clamping belt; 4 - branch pipe of the head / radiator; 5 - radiator; 5a - fixing bolt; 5b - removable bracket, 6 - right cover. 7 fan blades 8 - fan motor, 9 - fan cover; 9a - fastening of wires supplying the fan; 10 - branch pipe of the surge tank / branch pipe of the stove; 11 - radiator thermal switch; 12 - surge tank. 13 - branch pipe of the surge tank / radiator; 14 - cork; 15 - outlet fitting.
4 The engine is also flushed in the opposite direction. To do this, disconnect the stove hose from the pipe C (pic. 2.4), as well as unscrew and move the return pipe 12 away from the engine housing.
Pic. 2.4. Cooling system - 1.1 and 1.3 liter engines
1 - thermal switch 2 - gasket; 3 - thermostat housing; 4 - gasket; 5 - thermostat; 6 - cover gasket; 7 - thermostat cover; 8 - radiator; 9 - water pump gasket; 10 - water pump; 11 - manifold outlet fitting; 12 - metal tube; 13 - elastic pipe; 14 branch pipe of the thermostat housing / head; A - entrance to the metal tube from the lower radiator pipe; B - entrance to the metal tube from the stove; C - exit from the thermostat housing; D - outlet from the thermostat to the radiator; E - entrance to the metal tube from the drive manifold; F - outlet from the thermostat housing to the drive manifold.
The return pipe is screwed on with two bolts under the carburetor. Insert a water hose into port C and flush the engine until clean water comes out of the housing.
5. The use of chemical cleaners is a last resort. Regularly checking the concentration of antifreeze with anti-corrosion additives during inspection after 15,000 km should prevent contamination of the system.
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