Carry out removal of the thermostat in the following order:

Fig. 4.1. SOHC engine cooling system: 1 – radiator; 2 – thermostat; 3 – connecting branch pipe; 4 – broad tank; 5 – top cover;    6 – air inlet; 7 – arm of the fan (EZ); 8 – arm of the fan (PB, RP); 9 – arm of fans; 10 – additional fan; 11 – driving belt; 12 – electric fan

Fig. 4.2. DOHC engine cooling system: 1 – radiator; 2 – pump; 3 – thermostat; 4 – a broad tank; 5 – oil heat exchanger; 6 – back cover; 7 – fan arm; 8 – arm of fans; 9 – electric fan; 10 – additional fan; 11 – driving belt; 12 – top cover; 13 – air inlet

– the thermostat 2 (see  fig. 4.1 ) and 3 (see  fig. 4.2 ) is located in the basis of the case of the water pump;

– merge cooling liquid from the cooling system;

– turn off two bolts of fastening and uncover the thermostat;

– remove a sealing ring;

– get the thermostat from the case in the basis of the water pump.

PREVENTION Before removal of the thermostat note its situation in the case.

Carry out check of the thermostat in the following order:

Fig. 4.5. Working provisions of the thermostat: a – the thermostat is closed; – the thermostat is open

– if the thermostat is in open situation (fig. 4.5) at the room temperature, then it is subject to replacement;

Fig. 4.6. Check of the thermostat

– for check of the thermostat lower it on a twine in a container with water (fig. 4.6) . Gradually heating water, measure temperature at which the thermostat begins to open and completely will open. Take the thermostat from water and check that it was completely closed after cooling. Replace the thermostat if its parameters differ from technical requirements.

Carry out installation of the thermostat in the following order:

– clear the case of the thermostat and the interfaced surfaces;

– install the thermostat in the case in situation in which the thermostat was before removal;

– establish a new sealing ring of round section;

– establish a cover and tighten fastening bolts the required moment;

– establish cooling system hoses, an arm of the pump of the amplifier of steering;

– establish a driving belt of the pump;

– fill the cooling system with liquid.