The primary purpose of an air conditioner (AC) in a vehicle is to cool the interior by removing heat and humidity from the air. The cooling process in traditional automotive AC systems relies on the use of refrigerant, which undergoes a phase change from a gas to a liquid, absorbing heat from the surrounding air in the process.
If you wish to use the AC without cooling the vehicle's interior, it would be challenging to achieve that without refrigerant or modifying the AC system significantly. The refrigerant is a crucial component of the cooling process, and without it, the AC system would not be able to effectively remove heat from the air.
However, you may have some control over the temperature by adjusting the AC settings. Modern vehicles often have options to control the fan speed, temperature, and air distribution. By adjusting these settings, you may be able to create a milder airflow without using the cooling function, but it won't completely eliminate the cooling effect.
If you specifically want to circulate air inside the vehicle without cooling it, you can use the ventilation mode or the "recirculation" option if available. This setting takes the air from inside the vehicle and recirculates it without drawing in outside air or engaging the cooling function. Keep in mind that the air may still be slightly cooled due to the AC system's design, but it won't actively cool the air like when the refrigerant is in use.
Remember, modifying the AC system or attempting to operate it without refrigerant could lead to improper functioning or damage to the system, so it's advisable to consult with a professional technician or refer to the vehicle's manual for specific guidance.