how do you change out auto A/C valve core?

I am trying to replace a leaky valve stem. And I didn't know how to get to the valve core and when I get there how do I change it? The charge is recovered. It is a 2000 Impala. Thanks in advance.Noah

Answer:

You say you want to change out the valve stem but can't find the valve core but the charge has been recovered. How did the charge get recovered without knowing where the valve core is. That's where the charge was recovered through. Also, if you have a leaking valve stem how did you still have a charge to recover, it would have leaked out through the leaking valve stem.

William H you are correct and sometimes there is a pressure switch screwed on the hi port. We must of went to the same classes ,and read the same books, over the years. Mike S You had said the belt was bad. It said NO POWER TO A/C, you know better then that! I have taught many techs both older and young. The older techs think they know it all WRONG. But you know what there is not one guy that leaves my class, who is not smarter.

Schrader Valve Core

Ac Valve Core Removal Tool