No you don't have to change the A/C Compressor.
R134a
R134a . All vehicles after 94 went from R12 to R134a
A 1998 Buick would have been built with R134a.
Chevy switched from R12 to R134a for the model year 1994. Your truck should be R134a.
No
None, the refrigerant is R134a not Freon which is R12.
None - a 1995 model year car uses R134a refrigerant, not R12.
It may have been built with R12, it will need retrofitted to R134a.It may have been built with R12, it will need retrofitted to R134a.
You do not as R134a is what is approved for that car. If you could find R12 it would cost you near $100.00 a pound.
Was built for R12, should be converted to R134a
Would have been built with R12, can be converted to R134a.
The original refrigerant installed at the factory in 1973 was R12 (Freon). If it has not been converted to R134a, I suggest you convert it now, if it is leaking and needs repair. R12 is no longer in production and the dwindling supply is very expensive. Much cheaper to convert it to R134a.