When you live in a tropical country like Singapore, driving with your air condition unit running is must. But aside from that, it’s not enough that it is running but it should also be running smoothly otherwise it’s no use having it in the first place. That is unless you like driving uncomfortable and drenched in your own sweat. Just imagine your AC unit not working properly, everyone from the driver to the passengers in the car will suffer. Here are some of the AC unit scenarios where you should immediately take your vehicle to your mechanic.