1994 Cavalier AC LOW SIDE FILL???

Can anyone tell me where the low side fill port is. I see one that says factory only do not use for pressure test and the only other one is on the condenser. Which one is it? I know it is not the red one on the high side. Help. by the way it is 2.2 liter motor.

Thanks,
Kevin

on the condenser is the low side

Thanks that is what I thought filled it up and the a/c blows ICE COLD...awesome.