What causes ac freon leaks ?

Moisture in an A/C system.

If moisture enters the A/C system, it mixes with the refrigerant to form harmful acids. These acids damage the ac components from inside out.

How to prevent acids from forming.

The method of removing any moisture from the A/C system is to pull a deep vacuum on the system. Pulling a deep vacuum on the system, will cause any moisture to vaporize and be pulled out of the system.

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