Note: When installing the thermostat, use a new O-ring.
Models 1.4 and 1.6 l (except C16 NZ2)
Removal
1. Partially drain the cooling system as described in Chapter 2.
2. Remove the timing belt and camshaft sprocket as described in Sections 2A or 2B (depending on the model).
3. Loosen and remove the two upper bolts securing the rear timing belt cover to the cylinder head and the lower right bolt securing the cover to the cylinder block.
4. Disconnect the hose from the thermostat housing.
5. Move the rear timing belt cover away from the cylinder head (forward) to gain access to the two thermostat housing clamp bolts.
6. Loosen the two thermostat housing clamp bolts and remove the housing (see illustration).
7. Remove the thermostat from the cylinder head. Keep in mind that coolant may leak from the lower radiator hose (see illustration).
8. Remove the O-ring from the thermostat.
9. If required, the operation of the thermostat can be checked as described in Chapter 10.
Installation
10. Installation is carried out in reverse order, paying attention to the following.
11. Install the camshaft sprocket and timing belt and tension the timing belt as described in Sections 2A or 2B.
12. Fill the cooling system (Chapter 4).
(Text copied from this portal: OpelBook.ru)
Models C16 NZ2, 1.8 and 2.0 l
Removal
13. Remove the lower engine skid plate, if equipped. Partially top up the coolant from the cooling system as described in Chapter 2.
14. Disconnect the upper radiator hose from the thermostat cover.
15. Loosen and remove the thermostat cover clamp bolts and remove the cover together with the thermostat. Remove the O-ring (see illustrations).
16. If required, the operation of the thermostat can be checked as described in Chapter 10.
17. Please note that the thermostat should be replaced together with the cover, as it is impossible to separate them.
Installation
18. Installation is carried out in the reverse order. Use a new O-ring and finally fill the cooling system as described in Chapter 4.
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