I bought a 134 kit to recharge the a/c on my 2005 Saturn Relay, but I’m not sure where the low side port is.
RE: n general the low side port is the larger or the two fittings. Depending on what size V6 engine you have and if your Saturn Relay has rear A/C, the low port is one on one line, the other on a different line. Check the pipe coming off the back of the compressor for one, and for the other- near the condensor.