Air conditioning in a vehicle cools the interior of a vehicle, and can actually be important to prevent the driver becoming drowsy due to overheating. As with all parts of a vehicle, the air conditioning system is prone to faults. Due to the air conditioning system being quite complex, it is often difficult to determine exactly what is wrong. This article looks at the most common problems regarding air conditioning in a vehicle and how to repair them. Not Providing Cooled Air This is perhaps the most common problem with air conditioning units in vehicles. When you go to turn the system on, it seems to work, but will not blow out cool air. The usual cause of this is a lack of the refrigerant fluid, which is critical to allow the system to work properly. To rectify the problem, top up the system with replacement fluid, or refill completely if needed. System Has A Leak And Only Cools Occasionally Although some older vehicles can lose some refrigerant through leaking, this is a normal process for these aged vehicles. Leaks can cause the system to work in an intermittent fashion. To find out where the leak is, you can purchase some dye fluid and apply it to the system. Usually, a leak can be traced to worn or damaged seals or o-rings. Replace to fix the leaks and allow the system to provide you with constant cooled air. Conditioner System Blows Foul Air The air conditioning unit – especially the evaporator – may be harbouring and growing tiny, microscopic organisms that are ejected into the vehicle when the air conditioning is activated. This is not only unpleasant to smell, it can be dangerous due to the potential of breathing these organisms into the lungs. To address this problem, the vehicle owner has two choices: one is to purchase a spray which eliminates these organisms by being applied into the vents; the other option is to hire a mechanic to apply a special coating to the evaporator which prevents organisms from growing there in the first place. System Makes A Noise When Operating This is another fairly common complaint from vehicle owners who use their air conditioning system. In the majority of these cases, the noise emitted by the air conditioning can be traced to a faulty – or nearly broken – compressor in the system. To remedy this, it is probably best to have the component replaced by a professional, unless you are a competent DIY vehicle mechanic. Other, less serious problems regarding noise may simply be debris stuck in the fan. It is a good idea to run your system frequently, to keep it in a good overall...