Kestas,
He has said he has the original Receiver Dryer.... you think that replacing a 24 year old Receiver dryer , which would probably cost about $35 dollars is " willy Nilly " ..... ?

And concerning the " a part that normally does not go bad " NOT TRUE... when they get OLD the bag which holds the silica jell just ROTS off or vibrates to death... and contaminates the rest of the system...

I would carefully get this Receiver out and replaced and not take the chance that while adding refrigerant it decides to let go....