4.17. Engine cooling system: 1 – expansion tank cap; 2 – expansion tank; 3 – coolant drain hose from the throttle body; 4 – hose from the radiator to the expansion tank; 5 – radiator drain hose; 6 – left radiator tank; 7 – aluminum radiator tubes; 8 – plug; 9 – right radiator tank; 10 – drain plug; 11 – radiator core; 12 – Electric fan casing; 13 – electric fan impeller; 14 – Electric motor; 15 – pump toothed pulley; 16 – pump impeller; 17-toothed camshaft drive belt; 18 – engine cylinder block; 19 – pump supply pipe; 20 – radiator supply hose; 21 – heater radiator outlet hose; 22 – coolant supply hose to the throttle body; 23 – outlet pipe; 24 – filling hose; 25 – heater radiator supply hose; 26 – thermostat; 27 – Engine management system coolant temperature sensor
The cooling system (Fig. 4.17) is liquid, closed type, with forced circulation of coolant, with expansion tank 2, in which a coolant level indicator sensor for the on-board monitoring system is installed.
The centrifugal coolant pump is driven by a toothed belt 17 of the valve timing mechanism.
The electric fan is equipped with a plastic four-blade impeller 13, mounted on the shaft of the electric motor 14, which is switched on and off by the controller engine management systems.
Thermostat 26 with a solid temperature-sensitive filler has a main and additional valve. The main valve starts to open at a coolant temperature of (85±2)°C, the main valve stroke when the coolant temperature reaches 102°C is at least 8 mm.
The radiator is a tubular-plate type, made of aluminum, with plastic tanks 6 and 9. The radiator is two-pass with a partition in the left tank. The coolant is poured through the filler neck of the expansion tank 2, in the plug 1 of the expansion tank there are inlet and outlet valves. The opening pressure of the outlet valve is 110–150 kPa (1.1–1.5 kgf/cm²), the inlet valve is 3–13 kPa (0.03–0.13 kgf/cm²).
The cooling system is filled with Tosol-A40M coolant.
Location of cooling system elements in the engine compartment: 1 – hose from the radiator to the expansion tank; 2 – radiator outlet hose 3 – radiator inlet hose; 4 – radiator; 5 – thermostat; 6 – coolant supply hose to the throttle assembly; 7 – coolant drain hose from the throttle assembly; 8 – coolant level sensor in the expansion tank; 9 – expansion tank; 10 – expansion tank cap; 11 – casing with fan