Yeah, the external unit is the problem. In most cases, the switch/relay for the fan and the compressor are the one and the same, so if the fan doesn’t work, the compressor probably doesn’t work as well. If the compressor works, but the fan doesn’t, you’ll probably hear just a buzzing sound from the external unit. Still, it will cool, just a lot less. The fan is needed to draw the hot air from the raidiators, cool the colling liquid down and pass the cold liquid back to the internal unit, so it can use it to cool the air inside.
An AC is basically like a big energy exchange system. Draw energy (heat) from one end, release it at the other, but in order to do that, you need both fans and radiators to be present at both ends, cuz the heat exchanger in this case is air.
Yeah, the external unit is the problem. In most cases, the switch/relay for the fan and the compressor are the one and the same, so if the fan doesn’t work, the compressor probably doesn’t work as well. If the compressor works, but the fan doesn’t, you’ll probably hear just a buzzing sound from the external unit. Still, it will cool, just a lot less. The fan is needed to draw the hot air from the raidiators, cool the colling liquid down and pass the cold liquid back to the internal unit, so it can use it to cool the air inside.
An AC is basically like a big energy exchange system. Draw energy (heat) from one end, release it at the other, but in order to do that, you need both fans and radiators to be present at both ends, cuz the heat exchanger in this case is air.