A8L V8-4.2L (BFM) (2004)
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Disconnect coolant hose (arrow) from thermostat housing.
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Remove bolts -1- and -2- and take off thermostat housing.
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Remove O-ring and thermostat.
Installing
Note: Replace gaskets and O-rings
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Clean and smooth down sealing surface for O-ring as required.
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Install thermostat.
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Installation position: vent valve (arrow) faces up
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Install thermostat housing.
The remaining installation steps are performed in the reverse sequence. Note the following points:
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Install toothed belt (adjust valve timing).
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Fill with coolant.
Tightening torques
Thermostat housing to cylinder block ..................................................................................................................................................................... 14 Nm 1)
Upper ribbed belt idler wheel to torque support .......................................................................................................................................................... 10 Nm
1) Bolt strength rating 10.9