30 amp AC/HTR breaker keeps tripping out on AC

[egk4th]

I have 1997 Winnebago Brave 31RQ, Chevy 454 P30 chassis and the dash AC system cools but keeps tripping 30 amp breaker after minimal use during moderate outside temp.

[Skip426]

Given that the 12 volt C/B is 20 years old , it may be weak , and I'd say install a new unit first .
If the new C/B trips , then you would have to determine , if the problem is with the blower motor or the A/C compressor's magnetic clutch .
Most systems have the power from the C/B running to the dash control head, split to the blower motor , for one side of the system, the other side , runs through the thermostat control, the low pressure switch and to the compressor clutch.
If the C/B doesn't trip while using the dash heater , then the blower motor should be ok, to determine if the compressor magnetic clutch is the issue , you could wire in an inline fuse holder , between the low pressure switch and the compressor with a 15/20 amp fuse to see if it blows, and the electromagnet needs replacing.

[egk4th]

thanks, i'll try what you suggested