Air Conditioning
Since refrigerant acts as a working fluid much like how motor oil is the fluid which provides lubrication to protect the engine, a refrigerant breakdown will result in ugly wear and tear, starting in the compressor. From there, the sharp and grimy metal particles created during compressor breakdown can then travel through the rest of your car aircon system, wreaking havoc on the entire system. All cold air, and airflow for that matter, will be long gone even before you send your car our workshop for some checking.