Dometic AC compressor

One of the things I will never emotionally understand is why the !@#$@#$@ they do not install the hard start caps at the factory

Academically I know the an$wer to that que$tion but ala$... $tupid they are.

They do not install start kits any more, just install one and odds are it will be fine.

try one of these. they work

I'd check the start capacitor. It would be round in a black plastic can maybe 3 or 4 inches high and about 1-1/2 or so around. If it shows any sign of something coming out of it, it's bad and needs to be replaced along with the start relay that controls it. Some use solid state devices these days instead of relays. Replace the capacitor and it at the same time. The start capacitor is only meant to be in use less than one second to get the compressor started and then must be disconnected to wait for another start. If the relay fails to disconnect the start capacity as it should, the capacitor will quickly overheat and be ruined. The compressor's start windings could be ruined at the same time so don't keep trying it. The capacitors are a lot cheaper than replacing the whole unit if the compressor burns up.

Typical roof airs do not have service ports. In my experience problems with the compressor or refrigerant loop generally find you replacing the roof air rather than repairing.

I have seen some handy folks add service ports and repair refrigerant leaks and recharge with good success. Not a task for us mere mortals. :)

Good luck.

I would call a regular AC tech and have them check it out
.Jerry Parr