I put on a new compressor on my 97 Grand Prix a while back and I think I have a leak allowing the free on to be leaking out. It is a slow leak. The compressor will no longer engage, so I am needing to re fill it. I hooked up the gauges and yes it was low. I hooked the blue line to the low side, the big line back by the firewall. Hooked the yellow line to the can and opened the valve. Turned the AC on max, opened all the valves and even cracked the yellow line a little bit to get the outside air out then shut it. The can was hooked up for 20 minutes-I was shaking it like instructed and it never emptied and the compressor never kicked on. It acts like it is not drawing the free on out of the can into the line. I read somewhere that putting the can in a pale of warm water will force it into the line to engage the compressor. I am stumped and any help would be appreciated. Also, how many pounds should the blue guage read when fully charged? The parts store guys told me it holds 36oz when it is completely empty.
Thanks
