If you notice that the air coming out of the vents is not as cold as it should be or as it used to be, this may be a sign that the system has a refrigerant leak or that the compressor is not working properly.

If you hear unusual noises when the air conditioner is running, such as clicks, hisses or squeaks, it could indicate a problem with the compressor, the compressor clutch pulley, or possibly blockages within the system.

If you notice an unpleasant smell when you turn on the air conditioner, it may be a sign that there is mould or bacteria growing inside the system, which requires professional cleaning.

If the air conditioning system does not adequately remove moisture from the air, you may notice excessive fogging of the windows or a damp feeling inside the car, indicating a problem with the evaporator or drain.

If you notice stains under your car that are not water stains (especially if they are green, blue or yellow in colour), this could indicate a refrigerant leak from the air conditioning system.

If the air conditioning button does not activate the system or if the system turns itself off, there could be an electrical problem or a problem with the switch itself.

If the temperature of the air coming out of the fans changes without you changing the settings, this could indicate a problem with the air conditioning control system.