Dismantling the thermostat with a 16V motor. Thermostat (1) suspended (arrow) in the outlet pipe (2). To unhook it, strongly press the thermostat spring plate, turn the thermostat and remove it from the pipe.
Removing the thermostat
The stuck thermostat in the 1.6L eight-valve model cannot be dismantled on the road without a well-stocked tool box. The thermostat is located on the front side of the engine behind the timing belt cover. On models with other engines, the thermostat is located on the right next to the exhaust manifold in the cylinder head. Dismantling is not a problem.
Drain the coolant into a container.
8-valve engine with a displacement of 1.6 liters: loosen the alternator V-ribbed belt and remove it, see alternator chapter.
Disconnect the coolant hose from the thermostat housing.
Remove toothed belt, see engine chapter.
Remove the rear toothed belt cover.
Loosen the thermostat housing mounting bolts and remove the housing.
Remove the thermostat from the engine block.
When installing, insert a new O-ring into the engine block. Tighten the bolts to 10 Nm.
16V engine: Loosen the coolant hose at the outlet fitting and then remove.
Unscrew a branch pipe of a drain aperture from a head of the block of cylinders and remove together with the thermostat.
Firmly press the thermostat spring plate, turn the thermostat and remove it from the outlet pipe.
The defective thermostat is replaced along with the coolant outlet.
Use a new O-ring when installing. Tighten the bolts on the 16V 1.6L engine to 8 Nm and on the 16V 1.8 and 2.0L engines to 15 Nm.
Fill with coolant after installation.
Thermostat check
With the built-in thermometer, you can control whether the coolant flow regulator opens at the prescribed temperature:
Remove the thermostat.
Hang the thermostat in a container of water and heat the water.
Check whether the valve disc in the seat rises and opens completely.
The following values are set for the Vectra motors:
Start of opening at 92°C, end of opening at 107°C.
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