Your using the wrong AC fill system! Those all in one trigger unit's are junk. I've never gotten one to work yet, but they leak like a sieve. As far as your AC pump is concerned, you will not get the pump to come on unless you get some pressure into the system first. Your can of Refrigerant will turn cold when it is being inducted into the system properly. However, too much oil in your system will reduce it's effectiveness for cooling. This could be your problem since refrigerant leaks are usually gaseous and not liquid and refrigerant oil will remain oil even at atmospheric temps.