where is the low air connection to recharge the ac system on 1998 pontiac firebird?

Answer 1

The low side connection port for the AC is usually located on the side of the accumulator. It also can be on one of the low side lines heading into the passenger compartment. Due to space problems, a lot of times these are hidden. Good luck.

Answer 2

This is how it works, you have high pressure liquid going into your evapitor where the expansion valve or orfice tube sprays the high pressure liquid into low pressure gas and in effect cooling the evapirator and then the low pressure gas goes to the compressor where it is pumped up to high pressure gas and run through the condenser where it gives off heat and turns the high pressure gas to high pressure liquid and back to the evapitor. Your low pressure port will be on the line that runs from the evapirator to the compressor

Answer 3

Near the heater/ firewall on passenger side. It is the larger of the two lines.