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Message: <blockquote data-quote="bigmike636" data-source="post: 1465281" data-attributes="member: 24813">I’m actually an HVACR technician who specializes in industrial refrigeration, so I tend to be “by the book” in regards to A/C repairs. With that said, I have personally used AC Pro on my old 1999 pick-up and it worked great. Obviously, I have a very small leak somewhere on my system because it usually takes 2-3 years before I need to “top off” the charge.  If you check the standing pressure in the system and it’s still in a positive pressure, you should be ok to top it off.   If you had replaced a major component, like the compressor or the condenser, I would definitely advocate for you to utilize a shop to pull a deep vacuum on the system. But if you just have a slight leak, there’s nothing wrong with using one of the popular charging products.  While you’re at it though, you may want to change an in cabin air filter, if your vehicle has one. You may also want to try and clean the condenser up in the front of the vehicle.   But even if you do have a leak, don’t be afraid to try and tackle fixing it. It could be caused by a leaking o-ring. A leaking o-ring could be an easy fix which just entails you using a couple of wrenches to open up the fitting, swapping out the bad o-ring for a new one, then tightening the fitting back down.  You could use a commercial bubble type leak spray or even a little good old dish soap, slightly watered down in a spray bottle to try and leak check your system. Sent from my iPhone using Tapatalk</blockquote>