Re-instating the a/c sysytem on these is no big deal as long as the correct procedure is adopted.The current a/c gas(r134a) can be used without any problems but you will need some retro-fit adaptors for the vacuum/charging process which remain on the car for future maintenance.Also I would recommend renewing the filter/drier assy to one which is r134a compatible.You will also need retro fit oil for the system ,which any good a/c engineer would have.I very much doubt if a Jaguar of this age will have any o ring seals as the pipe joints are flare/compression fit and seal.Also make sure the cooling system is up to scratch,as the new gas runs slightly hotter.The quantity of gas re-fill needs to be reduced by around 10-15%.Tbh I have converted many older cars to the new gas,and have only ever changed seals on components that have been replaced or disturbed during the re-work.All that is needed now is to find an engineer copetent to carry out the work.Buena suerte.hth
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