We have a 2013 Phaeton RV with a dash AC that has got tired of putting out cold air. I just tried it while sitting at our camp site. There is something up front that runs off and on about every 15 se...
What's difficult for some is simple for others. If your condensor is in the front with it's own 12V fan, that could be what you are hearing and it's cycling because of not enough freon...R-12, R-13B1, R-22, R-502, and R-503 are all freons.
Buy a 134 recharge kit with a gauge...WalMart $20. Hook it to the low pressure port at the compressor...the only one it will fit on. If it's not in the green while running, then add 134 until in the green...should not take more than one can.