Although air conditioning is a luxury item, most people consider it a must in the warm seasons. Properly servicing an A/C system is very important. All A/C systems work at different set pressures determined by the vehicle manufacturer when they build the system. If a system is undercharged, or overcharged the improper pressure level can cause extreme damage to the system. Since most components contained in the A/C are very costly it is a good idea to keep them properly maintained. A lot of people do not realize there is also a lubricating additive (oil) added to A/C systems. Without this your system will start to ruin important internal components.