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How to service an air conditioner
Make sure the unit is turned off either at the on/off switch or by shutting off the circuit breaker.
Check the small copper pipe connecting the unit to the house.
If it feels hot, the unit's coils are most likely dirty and need to be washed.
Rake any leaves and debris away from the unit before you start to service an air conditioner. Take the cover off the unit, and locate the air conditioner coils (they look like a car radiator).