Repairing an air cooler can be done by following these steps:

1. Unplug the air cooler from the power source.
2. Check the air filter and clean or replace it if it is dirty. The air filter is usually located behind the front panel of the air cooler.
3. Check the water tank and ensure that it is filled with clean water. If necessary, clean the water tank to remove any buildup or debris.
4. Check the water pump and ensure that it is working correctly. If it is not working correctly, refer to the section on repairing or replacing the water pump.
5. Check the fan blades and ensure that they are clean and free of any debris. Clean the fan blades if necessary.
6. Check the fan motor and ensure that it is working correctly. If it is not working correctly, refer to the section on repairing or replacing the fan motor.
7. Check the control panel and ensure that all the buttons and switches are functioning correctly.
8. Check the power cable and ensure that it is securely connected to the air cooler.
9. Plug in the air cooler and turn it on to check that it is working correctly.

If the air cooler is still not working correctly, it may require professional repairs or replacement.

It's important to note that repairing electrical appliances can be dangerous and may pose risks of electric shock.it may be best to hire a professional from Locals4u for assistance or contact the manufacturer for guidance on repairing the air cooler.