Preventive maintenance measures can increase the overall life of an Air Cooler.
To keep your air cooler in top condition, please check the following:

Keep regular check of the motor and oil cooling.

Checking for any loose connections in internal electrical components. Cleaning of the submersible pump impeller and checking other parts for proper water flow.

Cleaning of water distribution pipe/channels for even distribution of water on all sides.

Regular cleaning of the internal/external parts of the cooler body with a dry cloth.