Make you sure you gear up your car AC before summer.
Open it up:
Remove the components that make up your air conditioning system. This will allow you to properly flush out debris. Take out all hoses, evaporators, condensers and other parts.
Clean the stuff:
Flush out the debris using an aerosol air conditioning flush. Other flushes leave an oily residue. Begin flushing by placing the nozzle at the component’s mouth and running the flush through, allowing it to leak out the opposite end.
Search for the ducts:
Search the ducts leading to your car’s cabin, for leaks. These will be large tubes that lead from the zigzagging tubes of the evaporator. If you notice openings, which allow cool air to escape before reaching you, apply a generous amount of duct tape to the hole to keep it closed.
Remove the accumulator:
Remove your car’s accumulator. This coffee can-shaped element helps to remove debris as it prepares to enter your automobile. This filtration system needs maintenance.
Replace if required:
Purchase a new accumulator. Install by bolting in just as you removed the soiled accumulator, and attaching all proper hoses.
(With inputs from ehow.com)