How to fix a air conditioner myself?

my window air conditioner blows very slow and feels like it doesn't push out the cold are.

you can probably find your answer on youtube :DD !!

Check to make sure the filter is clean for air to pass through and that the fan is running at the normal speed. If both are OK, it may need to be recharged.

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I think its better for you to take a help from Air cooler dealers or air cooler manufacturers. We can make mistakes. I share you sites on which you will get some help
https://www.pickeronline.com/nagpur/ac-dealers