A/C refrigerant leaks are frustrating because the system can work great for years, then slowly lose its cooling efficiency until you notice the cabin isn't cooling the way it used to. Most leaks start small, so the symptoms can come and go depending on heat, traffic, and fan speed. That is why it can feel like the A/C is being moody instead of failing. The key is knowing why these systems leak in the first place and what actually needs to be checked. Why Car A/C Systems Leak More Than You Expect A car A/C system lives in a rough environment. It deals with vibration, engine bay heat, road spray, and constant pressure changes as the compressor cycles. Unlike a stationary home system, vehicle A/C lines flex and move, and those tiny movements add up over time. Seals also age. Rubber O-rings and gaskets harden with repeated heating and cooling cycles and gradually lose their ability to remain perfectly sealed. Even if a leak is slow, it still reduces performance, an ... read more