When you're inside your vehicle, the only A/C part that you will see is the A/C evaporator. It's located under your dash, and its function is to absorb the heat from your car cabin. It's similar to the condenser, only the function of these two parts is opposite. While the evaporator absorbs heat, the condenser dissipates it.
When you look at the evaporator, you'll see that it also has coils. Refrigerant passes through these coils, and the refrigerant absorbs the heat coming from the surrounding environment. Afterwards, the hot refrigerant is passed on to other A/C parts until it reaches the condenser for heat dissipation. To achieve efficient absorption of heat, the AC evaporator has to be maintained at the correct temperature. Otherwise, it won't be able to absorb enough heat and the A/C will not be as efficient.
In relation to this scenario, one of the common problems associated with the evaporator is freezing. This happens when the temperature in the said component gets very low and it becomes too cold, in which case it is unable to absorb heat. To keep the temperature of AC evaporators at the proper limit, the orifice tube that is mounted before it should be working properly. This tube controls pressure to the evaporator, thereby preventing such occurrences as freezing. In some instances, a leak occurs on the evaporator. This is not easily noticeable and may require the use of a leak detector to find. Check your service manual for the procedure. Another common complaint involving the evaporator is a musty smell. This is caused by bacterial growth due to the condensation of water around the evaporator surface, and you can combat this by trying certain coatings for the evaporator coil or by using disinfectant on the coil.
One of the best times to work on the evaporator of your car is during an A/C conversion. If you're still using the old R12 refrigerant, it's time to convert to R134 system and save some of your hard-earned cash. You can find a car AC conversion kit that you can use for the process, and you can check each individual A/C part to find problems that you can address. Just be sure that you handle the refrigerant correctly as this is toxic to the environment. Also, have the right tools and manual with you, especially if you have little experience in this task.
If, during the inspection of the A/C parts, you notice any problem, check whether you can fix the problem yourself or whether you need a new part to do the job. If you need a replacement A/C evaporator, you can browse our selection of parts here at Parts Train to find the right component for your ride. Placing your order is also easy and this can be accomplished with just a few mouse clicks.