A lack of refrigerant in the A/C system indicates leaks that must be fixed before refilling.
While leak tightness tests were formerly performed using contrast agents, forming gas is nowadays the gold standard.

- Better efficiency and reliability
- A/C system testing under realistic pressure ratios
- Easier leak detection
- Cheaper than refrigerant and UV
- Safer to perform
- Absorbing residual moisture in the system
- No imparting with lubrication performance of compressor oil

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