Over time many car air conditioning systems may not cool and they used to. At the beginning of summer many car owners make this discovery. The number one trigger of an AC system not necessarily cooling well is small refrigerant. But when ought to a car's AC process be completely evacuated and recharged? As a regulation, anytime the AC system has been opened for service. This is when a leaky garden hose, evaporator or any other failed component may be replaced. Remember that when there is any Freon in the system at all, it ought to be recovered and recycled as a result of an AC machine. Each time a component is replaced, the drier (AKA Accumulator) should be replaced also. The drier has desiccant which absorbs moisture in the system. It's effectiveness is diminished after it is exposed to the atmosphere for any length of time. My websites: heat pump prices