| Split system means the condensing unit is outside and the air handler/furnace/A/C coil is inside.
((TROUBLESHOOTING OF THIS UNIT))
Many books have been written about this subject. I suggest you take a HVAC course at your local trade school so you can become informed about troubleshooting. It is a very involved subject. There are some sticky notes at the begining of this board that will explain a few items if you are just curious. | 
Linear Mode
