| Gauge Reading / Symptom | Image | Diagnosis & Action |
| Gauge reads 0 PSI (Completely Empty) |  | Major Leak. Your system has lost absolutely everything. Do not just add gas, it will leak out immediately. ✅ Action: You must use a Stop Leak product first to seal the system before attempting a refill. |
| Gauge is in “Low” / White Zone (e.g., 10-20 PSI) |  | Normal Low Charge. The system has slowly lost charge over time, which is normal for older cars. ✅ Action: proceed with using a standard Refill Kit or can. |
| Gauge is in Green Zone, but air is warm. |  | Mechanical Issue. Your pressure is correct, but it’s still not cooling. This usually means the compressor clutch isn’t engaging or there is an electrical fault. ✅ Action: Do not add more gas. Consult a mechanic. |
| Gauge is in Red Zone (Too High) |  | Overcharged or Blockage. There is too much pressure in the system, or a blockage is preventing flow. ✅ Action: STOP IMMEDIATELY. Do not add gas. Disconnect carefully. You need professional help to evacuate the excess pressure safely. |
| Symptom | Image | Diagnosis & Action |
| Compressor isn’t clicking on. |  | Pressure too low (yet). Modern compressors have a safety switch that prevents them from running if the system is nearly empty. ✅ Action: Keep adding gas slowly. As pressure builds past 15-20 PSI, you should hear a loud “click” and the compressor will start spinning. |
| The gauge needle is fluctuating wildly. |  | Compressor cycling. This is normal when the system is low. The compressor turns on, sucks pressure down, turns off, pressure rises. ✅ Action: Continue filling. As the system gets full, the compressor will stay on longer and the needle will stabilize in the BLUE zone. |
| The can is freezing up. |  | Rapid gas release. When compressed gas is released quickly, it gets very cold. ✅ Action: Pause for a minute to let the can warm up. Wrap a towel around the can, or hold it in front of the car’s warm radiator fan for 30 seconds to keep the gas flowing. |
| Symptom | Image | Diagnosis & Action |
| It blew cold for a week, now it’s warm again. |  | You have a leak. The new gas you just put in has escaped. ✅ Action: You need to purchase a Stop Leak kit and repeat the process. |
| I filled to the Green Zone, but it’s not extremely cold. |  | Potential Overfill or Weak Compressor. If you are at the very top of the BLUE zone on a hot day, you might be slightly overfilled. Alternatively, an old compressor might just be weak. ✅ Action: Drive it for a few days. If it doesn’t improve, do not add more gas. |
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