Don't have the equipment to check, no problem, here's a quicky vid on how to check for low refrigerant in your truck or car. There are a lot of things in an AC systems that can cause it to work improperly, but LOW refrigerant is the most common. It’s, & USUALLY the easiest to fix, even for the common person. This video is a quick guide and is NOT intended to cover EVERY possible problem. It's the quick & dirty check for the average person who doesn't have hundreds of dollars of equipment. The major cause of Low Refrigerant is a slow leak. ALL systems leak a little but over time they should last for 5-10 years before it leaks down enough to cause problems. "IF" the system has NOT been opened, lines disconnected, you can most of the time use a quick charge kit and you’re good to go. “IF” you opened the system, lines disconnected, you''ll most likely have to pull a vacuum on it AFTER you replace the seals, and Dryer/Accumulator. After repairs, make sure and do a good inspection on the lines and joints where the system connects together. You'll want to look for a dark oily area covered with dirt, or an area that is bright green. If you find such an area, change the seal or that component. The Condenser behind the grill if it gets hit with a large sharp rock can easily be punctured and you'll see that dark dusty oily area where the seal was broken and the refrigerant leaked out. Anyways do your homework BEFORE removing any parts. YOU CAN RENT vacuum pump and an AC gauge set to do the job correctly. Some Automotive stores like AutoZone will rent them for FREE!. You put down a deposit on the equipment and when you bring it back you get ALL of our deposit back! If you open a system replace the dryer/accumulator to be safe, as a minimum. If you just opened it for part of the day and you have already replaced it, you can just pull a vacuum and it should be good. Hope this helps point you all in the right direction. If you learned something please give the video a thumbs up and if you would like to help my channel, please subscribe.

On a side note. Go check out the comments for Mike Smith below. Some GOOD info there as well.
** I'm working on a series on how to completely rebuild the AC system by replacing EVERY item in the engine bay related to the AC System. I shot the videos already, I just need to edit them!
*** I'll show how to:
Replace ALL the components under the hood.
Find & test for leaks.
Pull a vacuum.
Recharge it.
List ALL the Part Numbers.
Where to find the parts cheap and get access to the tools WITHOUT BUYING THEM!
Thanks for watching and glad to help. Best Wishes & Blessings. Keith Noneya