Recharging A/c

Help guys!

I bought a sealment package that is suppost to fix leaks in my A/C system and I also need to add some more r134a.

Where is the LOW SIDE SERVICE port for our /AC systems? I thought I found it, but none of the nozzles fit into it :gun2:

Can someone please help me?!?!

2000 Olds Alero

Here is a pic of the engine:

[AftermathAlero]

the low side if its like the 3.4L engine is behind by the firewall on the passenger side.. it should have a blue cap.

The pic you have shows the high side of the system. where the radiator is.