Where is the port for adding R134A on a 1996 Buick Regal 3100?
it is under the air filter box. take out the 4 screws that hold
the top to the bottom, then remove the top of the air box. use a
10mm socket on the bolt next to the battery and take off the
bottom. then you will see the a/c accumulator. the port is right
there. hope it helps.