AC sometimes blows hot air

That issue would not be the compressor, it would be that you have a blend/temperature actuator in the heating system that is starting to fail.
Those actuators move doors inside the HVAC system that send air through the heater core or through the AC core (or both if you are on defrost) to give you the interior temperature you requested.
When they start to fail they will start routing the air wrong and you get cold air when you want heat, or heat when you want AC.
The other common failure if you have the system that is split so the passenger gets different temperature air is the interior temperature sensor, then you get odd air temperatures because the computer cannot tell what the actual temperature is.
However, if it is only one side with an issue it is more likely the blend/temperature actuator itself.

There is a TSB that might cover your problem. It relates to a guide pin on the actuator coming apart. To check this you remove the panel above the drivers side foot well and you can see the actuator. The pictures show the bad and good position for that pin.