Coils and filter need cleaning.
I have seen this where water has leaked into the ductwork and stagnated.
It could have a blown gasket which causes that smell. And there could be something loose in the interior of the air conditioner.
A smell coming from a reverse cycle air conditioner may be a signal that the filter needs to be cleaned. A smell like engine exhaust might be present if the air conditioner motor is in need of repair.
It sounds like there is a leak inthe evaporator section of your air conditioner. If this continues, the air conditioner will no longer cool and you may have to replace several components of the system. The smell is that of atomized esther oil.
because you have too many dead babies in your air conditioner tank
An air conditioner should not smell like smoke when turned on (or when turned off). I would have to suspect that the electrical insulation is burning.
sounds like your A.C. compressor clutch is locking up
clean it, then spray it with air freshener.
It sounds like there is a leak inthe evaporator section of your air conditioner. If this continues, the air conditioner will no longer cool and you may have to replace several components of the system. The smell is that of atomized esther oil.
Failed compressor
there is a leak in the compressor...
It is a matter of preference. However, you do not want a wall air conditioner to be too close to the floor. Usually they are installed about two inches from the ceiling or so.