Air conditioner cools for 30 minutes then stops cooling after 20 minutes starts cooling again what is likely problem

SOURCE: Maytag NMPEB08F2A Portable Air Conditioner

I have the same problem w/ a window unit - fedders unit under the Maytag brand. No idea how to fix it, but would be great to get some info on this.

SOURCE: Frigidaire air conditioner - no cool air coming out.

if you used it alot, i would check it for freon.
checkthe air filter, make sure it's not dirty.
check the front panel, make sure there's no "ice/frost" in the unit.

SOURCE: Samsung Ac compressor stops after 20 minutes and fan keep running

eventually,cycling process is doing done if the thermostat sense the configure temperayure set up it will trigger to stop your compressor motor as well as the blower fan,blower fan independenly to you compressor.if your thingking that your compressor is tripping off,check your operating current on one line using clamp ammeter and compare to the rated current that tag on
motor compressor body,if the current flow is higher than the rated current specified on compressor motor,well problem occured it will trip your compressor,because overload protector is becoming your thermostat.but if you got same current result it was cycling process.If tripping off maybe air is present in your system call qualified ac tech, to purge out air in system.

SOURCE: RV air conditioner. Compressor running, fan stops before cool

The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.

SOURCE: sunbeam 9000 btu air conditioner

Ask here, they can get virtually every Sunbeam manual