Hey guys .. I have a 2007 Escalade that’s been having an ac issue .. the ac has been getting warmer and warmer over the past six months. Seems like it needs a Freon charge. Went out and purchased some AC pro with a new hose to add the Freon. I hooked up the hose to the low side pressure connection but for some reason I cannot get the AC pro to go in. I thought maybe the can was bad and the hose was bad so I went out and bought a new can of ac pro and a new hose and for some reason the truck will not take the Freon. The can is pierced and connected to the new hose but still cannot get Freon in with new ac pro hose .. any suggestions?