It depends which engine is fitted. The 1.4/1.6 petrol engines require removal of the cambelt cover and cam belt to gain access to the thermostat. This in my opinion is not a job to be tackled lightly. One mistake replacing the belt could mean a trashed engine!!!! The 1.8 petrol engine is quite a bit easier as the thermostat housing pokes out from the side of the cambelt cover. Sorry, don't know about the 2.2 petrol or the diesels.
where is the thermostat
Drain the water from your radiator. Remove the radiator hose, from the thermostat housing. Remove the thermostat housing retaining bolts. Replace the thermostat housing gasket and reverse the process to install the new thermostat.
To change the thermostat on a 2000 Vauxhall Astra Estate diesel, first ensure the engine is cool and disconnect the battery. Remove the engine cover if applicable, then drain the coolant and remove the hoses connected to the thermostat housing. Unbolt the thermostat housing, replace the old thermostat with a new one, and reassemble everything in reverse order, ensuring proper sealing and tightening of bolts. Finally, refill the coolant and check for leaks before starting the engine.
its an estate 1.7dti
your thermostat is stuck you will find it at the end of the top rad hose where it meets the engine
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its behind the camshaft pully you have to remove the timing belt then the camshft pully to get to the thermostat and its housing bit of a nasty job really!!
behind the timing belt cover easy to fix