There may be more serious problems that would require a service technician like compressor issues. Refrigerant floodback occurs when the liquid enters into the compressor crankcase. This noise would usually occur when compressor starts up. Another issue could be oil leaks causing poor oil level in the compressor but it might probably be pretty rare.
It's more than likely the way your air conditioner is mounted that is causing it to make noise. Experiment with the shims and I'll bet it goes gone. Remember to unplug it from your electrical outlet before attempting to do any internal work on it.
Most problems that people face with ac units can be solved by simple maintenance and cleaning. A regular cleaning of the air conditioning unit grille and filter helps to increase its longevity and enable it to be more efficient at cooling. Sometimes particle aggregation inside air filter chokes the ducts and makes mid-air conditioner ineffective. This can be solved with a simple cleaning of the air filter.
The common problems with air conditioners are faulty cool, collection of water pools below the air conditioning unit, rattling sounds when the unit is concluding down, dysfunctional temperature control, etc. Some of these problems can be repaired by the proprietors themselves without calling for technical help. The air conditioner manual carries solutions to minor problems which are often easily implemented.
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