Single shaft (SOHC) engines
1. Disconnect the battery from the ground.
2. Drain the coolant.
3. Remove the air filter and air ducts (Chapter 4A).
4. Disconnect the hose from the thermostat cover.
5. Remove the camshaft belt, idler pulley, camshaft sprocket, rear belt cover (Chapter 2A).
6. Turn away bolts and remove a cover of the thermostat from a head of cylinders.
7. Pry and remove the thermostat from the cylinder head, paying attention to its location.
8. Hang the thermostat in a heated vessel with water and a thermometer (see photo). When the water begins to boil, the bypass valve of the thermostat should open. Otherwise the thermostat replace.
9. Check the opening temperature of the thermostat valve.
10. If the thermostat does not close during cooling, then it should also be replaced.
11. Installation is carried out in the reverse order. Replace O-ring.
Twin-shaft (DOHC) engines
12. Disconnect the battery from the ground.
13. Drain the coolant.
14. Disconnect the hose from the thermostat cover (or 2 hoses for 1.8 and 2.0 l engines). On 1.4 and 1.6 liter engines, the cover is mounted on a section of the thermostat housing mounted on the cylinder head. On 1.8 and 2.0 liter engines, the cover is attached directly to the cylinder head.
15. On the 1.8 liter engine, disconnect the wire from the temperature sensor.
16. Turn away bolts and remove a cover together with the thermostat. On a 1.8 liter engine, the cover is sealed with sealant.
17. On engines of 1.4 and 1.6 liters, unscrew the bolts and remove the lower thermostat housing from the cylinder head. If necessary, unscrew the temperature sensor from the housing.
18. Not the engine of 1,8 l turn out the gauge from a head of cylinders.
19. Check the thermostat (see above).
20. Installation is carried out in the reverse order. Replace gasket (sealing ring) thermostat. On the move 1.8 L, install the sealant cap.
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