No cold air coming out of my 2011 Ranger. And wow, it's hot this week. The AC gradually slowed down over a period of weeks, then, nothing. I guessed a recharge was probably the issue. I bought a recharge 12a kit - which says it recharges 134a & 12 coolant systems. I followed instructions (screwed can on, attached coupling to truck, turned screw on can to pierce, then unscrewed) but the pressure increased quickly. The pressure was heading for max on the gague so I stopped. Here is a pic of the hook-up I used: Am wondering if I've done something wrong. I'll try again in the morning when the engine is cool. Or could there be something I'm not doing maintenance wise, like an air filter or such that can get blocked? Any advice / help is most welcome!