Cliff B

Okay, so I have a Coleman-Mach and it's tripping the breaker ALL the time. This has been going on now for the past 3 summers. The 1st summer I limped through, then the 2nd summer came and the fan motor froze. Now it's the 3rd summer and instead of just tripping the A/C breaker, it's now tripping both the A/C and Main breaker. When I go to reset the breakers, they are very hot to the touch. Sometimes I can't keep my fingers on them. So I basically know too much current is going through them. I don't think it's the A/C unit itself. The 2nd summer when I had to replace the fan motor, I looked at the both the evaporator and condenser and both looked okay. Not too many bent fins and fairly clean (I was impressed by that). I have noticed that the fan "draws" air across the condenser and just puts it in that space where the compressor and fan motor are. I think that's piss poor design...but anyway. I also checked the capacitors. They are rusted on the top, but I didn't "see" any evidence of overheating. I.e. the tops seemed to be level. No bumps. When it finally cools off after about 6 or 7 pm, the A/C unit runs without tripping the breaker(s). And since the whole RV is heat soaked, I turn the fan on high speed and the unit runs continuously until about 2 or 3 am. It just trips the breakers when it's hot outside. So my question is, ironically, not how do I solve this issue but can I use a window unit A/C during the day instead of the rooftop unit? During the heat of the day, will that still trip the breakers? Also, way back when, I use to remember that when I turned on the bathroom light I could hear a little fan start behind the breaker panel. I don't hear it anymore. Does anyone know under what condition(s) that fan is supposed to run? And what is it's purpose? (Because, to me, it's too small to seemingly have any actual usefulness)