As the name suggests, this part traps the moisture which may have escaped in the system. It also collects all the contaminants like debris, pollutants, etc. It also acts as a temporary storage unit during periods of low or no cooling. It lasts for about three years if you are not a heavy user of your car’s AC. 

Some of the signs of your car’s AC drier gone bad are:

• Unusual noises
• Leakage of the refrigerant
• Foul smell
• Misted sight glass
• Ineffective cooling

When you encounter any of these signs, it is advisable to get your drier repaired or replaced as soon as possible so that other parts of your car’s cooling system don’t get damaged.