The AC condenser converts the AC gas (refrigerant) into a liquid form. In this process, it generates a lot of heat in the AC system. The job of the AC condenser fan is to remove the heat from the AC system by blowing air across the condenser. By removing the heat from the system, it keeps the pressure in the AC system down allowing the AC to provide the coolest air possible.
If you use the AC when the fan is not working, the AC will generate hot air. It will severely damage the major components in the AC system.
The AC system is a sealed unit. It is not something you will inspect or service unless you notice a change. If you notice a change in the temperature of the air through the AC vents (not as cold as it should be), schedule an inspection.
In addition to your comfort, air conditioning systems add value to your vehicle. You should keep your AC fully operational. In some systems, the hot and cold air are blended to achieve the desired temperature setting. In these cases, when the AC system fails, in addition to not getting any cold air, the entire temperature regulation can be thrown off.
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