Many possibilities, most likely it is out of r-134a refrigerant. May need a recharge or may need to find a leak that could cause the refrigerant to have leaked out. Although there are other potential problems.
You need to use R-134a
The correct type is 134A and should be listed as well as the capacity on a decal on the rad support or under side of the hood
According the 1994 Acura Integra LS manual, recharge the system with Refrigerant HFC-134a (R-134a)
Yes. That is the ONLY refrigerant you should use in ANY vehicle with a model year of 1995 or later.
91 will have r-12 freon but can be converted to r-134a easily
The A/C uses R-134A refrigerant.
The 1997 Pontiac Grand Prix GTP will use R-134A. Cars prior to 1994 used R-12, and after 1994 all cars were equipped with R-134A. The reasoning for this is because R-12 refrigerant contains CFCs (chloroflourocarbons) which deplete the ozone layer, whereas the more modern R-134A does not contain CFCs. Hope this helps!
You add refrigerant at the low pressure port but you do not add Freon. You add R134/134a. If you are having to add refrigerant then you have a leak that needs to be repaired first.
In the early to mid 90's all manufacturers were forced to convert to 134A
All vehicles now need to use 134A. If your Grand Am was not originally equipped to use 134A or has not been converted to use 134A, you'll need to do that now. Freon 12 is effectively, no longer available. * Most vehicles which came with R12 originally can be converted to R134 freon simply by changing a couple fittings and adding the R134 refrigerant. Something to keep in mind, though, is that if your R12 leaked out you will need to fix the leak or whatever you put in will soon disappear!
How many onces for 134A refrigerant does GMC Sierra use?
It's a CFC refrigerant.
It is located on the left side of the valve cover under the wires you will see the low port I hope it helps ....