No website on Air Conditioner Servicing (& Maintenance) ?

Does anyone know a good website that teach me step by step how to service ( and do commonly needed replacement) my single room (Window /wall mounted) Air Conditioner.
Googled website almost all only show companys that do air cond repair.
I want this as new hobby !
T H A N K S !!

Answers:
go to google (or any search engine) and type in "do it yourself" and a bunch of sites pop up. then look up air conditioning

Other answers:
If you need to replace your air-conditioner, check out this guide why do people need to eat food? why do people need to drink?

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