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.
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
There are many different locations one might go to find a review of the Vauxhall Astra Estate vehicle. One such resource is the What Car website, that offers reviews on many different cars.