Where is the low pressure service fitting on 97 pontiac grand prix?

[J*LUVZ*A]

I'm trying to recharge my air conditioner in my grand prix. I found a pressure fitting, but the hose end will not fit on it and I read that the hose will only fit the low pressure fitting plug. Please help.
I found it nevermind.

 

[GOOG CUSTOMER]

low pressure fitting will have a blue cap on it, with a "L".

the low pressure fitting is in back of the engine, down by the steering rack.