You can either look on the data plate on the compressor, or the vehicle owners manual. It really depends on year models allmost every vehicle produced after 1993 were r-134a refrigerant a/c systems, however prior to 1993 most were r-12 refrigerant a/c systems. Now some auto parts stores sell the do it yourself conversion kit, which converts the old r-12 cfc ( chlorine fluorine carbon) system to the r-134a hfc ( hydro fluorine carbon), this kit usually for GM vehicles includes a new filter dryer and new seals and gaskets which can tolerate the r-134a refrigerant. But you can have a pro mechanic do the work for you which runs around $500- $600 depending on quality. However other vehicles may need other things such as new compressor clutch to handle the higher pressure loads. I re-done my a/c on my Chevy S-10 with the diy kit, its fairly easy some kits may include the special tools and a instruction manual.
It came from the factory charged with R12 Freon. As this refrigerant is extremely expensive and hard to find, I suggest you convert it over to R134 Refrigerant.
R134a
R134a
Probably r134a.
R134a
r134a
AC System probably needs refrigerant added.
low refrigerant.
R134a refrigerant.
R134a Refrigerant
134A freon
An S10 is the same as a Chevy S10.