$2? spent to see if it just needs recharging is worth it. If you connect and find the pressure to be in the red zone from the start, it's likely a failed compressor. If it's on the low side, charge the system and see what happens. Similar happened to me last Sunday. The comp went out right while I was standing there charging the system. Luckily it's covered under CPO. It's now been a week and they have ordered a second evaporator since they damaged the original, the first shipped in was damaged also.