Hi, Just bought an Astra 'Arctic' 1.6 16v - 1997 'R' Reg. V pleased with it, but a couple of questions... Does it have an alarm? If so, does it simply activate when locking the central locking? Also - the AirCon seems not to work - when activated, it doesnt get any colder! Is this simply a re-gas thats needed? Or are there things I can check first? Many thanks. Ed.