Effects of Refrigerant Loss
The compressor is the most important part of the AC system but it can only function correctly if cooled properly. The oil in the system plays a roll much larger than just lubrication it also cools the compressor,. When the oil level drops it also means less cooling for the compressor. The lower the oil level drops the more damage that is done to the compressor. The lower the oil level drops the more damage that is done to the compressor. When the operating temperature raises the internal damage also increases.
The oil will show signs of corruption before failure will occur and if seen soon enough the problem can be solved. The oil should be clear when it is being used in the system. As the amount of oil in the system lowers the heat raises and begins to burn the oil, burnt oil will be darker and darker as the damage increases. Once the source of the leak is found and the oil swapped for new, future problems may be averted.