How do I find the slow leak on My Model CLJ42-1A, (S.N. 0304478477).

SOURCE: 5 ton goodman ac unit

You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over

SOURCE: install 2 ton 13 seer

Goodjob, now check the valves stems for leaks.! .....Thank-you-very-much!

SOURCE: freon leaking

First, you need to complain to the owner about the tech not informing you that the freon would leak out again. It's addtional costs that were not explained to you. If he's a good guy, he may credit you something if you decide to use him to complete the repair. Otherwise, take your money to someone else. And be sure to tell you friends about how you were treated. Vote with your wallet.
Now, He was not totally correct about finding the leak. In 99% of cases, when a leak is in a system, a detector is used to "Smell" the freon and give a signal that there is a leak So, in this case, freon needs to be in the system. Once the leak is found and verified, there can be no freon present in the section of the system that is being repaired. To keep it short, just a big safety no-no. If the leak is in the indoor coil (evap), chances are, they will not repair it. They will try to sell you a new coil. Since yours is only 4 years old, there is the possibility that there may be some sort of pro-rated warranty from the manufacturer. One never knows, ask about it.
Now, repairing an indoor coil is not a good idea. If it leaks once, it's going to leak again.....and again.....and again. Just replace it as they have to do basically everything it takes to remove it to repair it. You should replace it since it is already out. I do not know of any company that will patch leaking evaps. Just bad business. Customers not happy as other leaks soon show up.
Finally, removing all the freon may not be necessary. Ask him about "Pumping down the system into the condensing unit". This can isolate the entire indoor coil and piping so a repair can be done with minimal lose of freon. Remember, it also depends where the leak is at. It may not be possible to do this in every case.

Good luck and hope this clears up some things for you.

SOURCE: Blowing hot air, compressor not kicking on, just fan ? ?

are you speaking of the outside fan or inside? compressor should be a little warm but not boiling hot. the unit could be low on freon. if low it will run a while but the compressor will overheat and shut off leaving the fan running by itself ouside. if nothing outside is running check power. if you have power check the contacted outside to make sure it's pulled in. contacters are bad about going out on goodman untis. Also ants can get under contacts.