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I have a 2003 Grand Prix GT and the AC recharge port is right behind the motor on the firewall. Look for the silver pipes coming out of the firewall right near the middle. You will see the recharge port on one of the pipes there.
Still under warranty. Take it to the dealer.
It's down by the battery and air filter box.
You can go to WAL-MART and buy the recharge kit for the ac. It's very simple to do ,all the instructions are there.
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Try pulling on the knob. Usually these are press fitted on, and will pull off with a little effort.
Total recharge is 1.68 Lbs