Could anyone please tell me where I can plug my AC recharge can into my engine?

You did not hear this from me. 2 lines from the ac unit. Big line = low pressure, Little line = high pressure. You want the low line. You need to, most the time, jump the low pressure switch to get the ac unit clutch to kick in and start drawing it in. If there is enough pressure in the can it might start up enough to get it going. All of this info is on the assumtion that your system use emptied because of your discharge. If it is empty on it's own,you have a leak. I am simply just babbling here. I might be way off base because I am a.........ah.........third base ump. Yeap thats it.I read it someplace.