Welcome to Automotive Forums!! If you have a 1989 Buick Regal, the AC system would be filled with "R12" from the factory. If it has been retrofitted, it could be R134, or who knows what! R-12 has not been manufactured since 1996 in the US and other countries that are in compliance with the “Montreal Protocol” banning the production of fluorocarbons hazardous to the atmosphere.
I have no idea if “Austria” participated in that agreement or not, so you may still be able to get R12. Usually the system capacity can be found in the service manual or on the radiator shroud of the car. Usually, it takes about 32-35 oz of refrigerant if the system is empty. Keep in mind, if the system is empty, you must have a leak somewhere and you need to locate the source of the leak prior to refilling. Also, the standard recharge procedure dictates that you follow the proper evacuation (pulling vacuum) on the system prior to filling. If you fail to follow this procedure, you will be asking for more problems!!
By the way, your English is better than some of our more recent immigrants currently living in the USA!! Some of my friends & neighbors from south of the border, greet me with, " Senor Puto" whatever that means!
(I
respectfully return the greeting with, "
Up yur puto")
