Caution! When the engine is hot, the cooling system is under pressure. Never open the expansion tank cap immediately without first relieving the pressure by gradually unscrewing the expansion tank cap.
The circulation of the coolant in the system occurs using a centrifugal pump.
Electric fan (or fans on the VR6 engine) has a plastic impeller mounted on the electric motor shaft. The fan is switched on and off using a two-position temperature switch located on the left side of the radiator. In the first position, the temperature switch switches on the fan at a coolant temperature between 92 and 97°C, and in the second position - at a temperature between 99 and 105°C. If the coolant temperature drops, the temperature switch is switched on in the opposite direction. At a coolant temperature between 91 and 98°C, the temperature switch operating in the second position switches off the cooling system fan, and in the first position the fan switches off at a temperature between 84 and 91°C. On both engines, the switching temperature of the temperature switch is equal.
The expansion tank is also part of the engine cooling system.
Fig. 181. Part of the VR6 engine cooling system components: 1 - rubber support; 2 - Upper radiator hose from thermostat housing; 3 - radiator; 4 - radiator casing; 5 - bolt, 10 Nm; 6 - rubber washer; 7 - supporting leg; 8 - Right fan connector (black); 9 - clamp for the plug connector of the right fan; 10 - right fan; 11 - fan casing; 12 - inlet hose; 13 - pressure hose; 14 - High pressure air pump; 15 - hose clamp; 16 - bolt, 25 Nm; 17 - left fan; 18 - Left Fan Connector (Black); 19 - lower radiator hose (from thermostat); 20 - Temperature switch plug socket (black); 21 - Temperature switch for fan
In the VR6 engine cooling system, two fans are installed on the radiator 3 (Fig. 181): right 10 and left 17, with a casing 4 of the corresponding shape. Both fans have a separate electric circuit. On the VR6 engine, a secondary pump is located near the radiator - high-pressure air pump 14.
Fig. 182. Part of the cooling system components of the 2.0-liter engine: 1 - radiator; 2 - radiator casing; 3 - Upper coolant hose; 4 - bolt, 10 Nm; 5 - support rod; 6 - lower coolant hose; 7 - Fan mounting ring; 8 - cooling system fan; 9 - temperature switch plug socket, black; 10 - temperature switch, 35 Nm
The cooling system of the 2.0-liter engine has one fan 8 (Fig. 182) with a casing 2 installed on the radiator.
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