Question: how do you know if your car air conditioner needs regassing?
Answer: Air isn't as cold as it used to be – Your car's refrigerant may need to be topped off or recharged.
Foul smell like mildew coming from the AC vents – This could be an indication of mold in the system.
Unusual banging or rattling sounds – The condenser or fan belt could be worn out, or debris could be clogging the fan.