Dometic AC compressor
On our bedroom AC unit when you first turn it on, you can hear it click and the fan starts, then it seems like it lugs down trying to start the compressor. It will then run for about 3 mins and then ...
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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.
