Removal
Engines 1.4 and 1.6 l
Partially drain the cooling system. Remove the rear timing belt cover.
Unscrew the two bolts securing the thermostat housing, then remove the housing.
You can also remove the cooling system hose from the thermostat housing, then remove the housing.
Remove the thermostat from the cylinder head, keeping in mind that coolant may leak from the bottom of the radiator even if the cooling system has been partially drained. Remove the O-ring from the thermostat. The thermostat can be tested as described later in this section.
Engines 1.8 and 2.0 l
Partially drain the cooling system. Disconnect the upper radiator hose from the thermostat cover.
Unscrew the three thermostat cover bolts. Remove the sealing ring.
The operation of the thermostat can be checked as follows.
If necessary, the thermostat in the kit can be replaced.
Checking the work
You can check the thermostat by hanging it in a container of water. Heat the water to boiling point - by this point the thermostat should open.
The thermometer can be used to set the exact opening temperature of the thermostat and compare it with the required specification. In addition, the opening temperature is indicated on the thermostat itself.
A thermostat that does not close as the water cools needs to be replaced.
Installation
Engines 1.4 and 1.6 l
The thermostat is installed in the reverse order of removal; in this case, a new sealing ring is used and the following points are taken into account.
Check that the tabs on the thermostat housing fit into the grooves in the cylinder head.
Install the rear timing belt cover as shown in chapter 2.
Fill the cooling system.
Engines 1.8 and 2.0 l
Installation is carried out in the reverse order of removal, in which case it is necessary to install a new sealing ring, and after completing the work, fill the cooling system.
(Original source on the website: «www.opelbook.ru»)
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