The A/C compressor is one of those parts on your car that you pay no attention to, until it fails. The A/C compressor is the heart of the air conditioning system, without it you have no A/C. The compressor can fail for many reasons; the most common two are either the actual compressor motor wears out or the clutch stops working. Some compressors will let you change the clutch without replacing the whole compressor, others you have no choice but to replace the entire unit. When you have to replace yours, trust Seltec A/C compressors.