Hidden leak at Schrader valve core
Repeated cooling loss can continue even after several checks when the leak path is small and easy to miss. This was not a major leak, but it was enough to keep the top-up cycle going.
Case details
The assessment
When the issue repeats, we do not restart from the same assumption. We narrow the leak path and check the small service-port points that are often skipped.
- Repeat cooling-loss history matched a leak pattern
- Wider circuit checks did not explain the repeat cycle
- Leak signs appeared at the service-port valve core area
- The leak path was small but consistent
The diagnosis
The refrigerant was escaping at the service-port valve core. The leak was small. It was easy to miss during quick checks. It was still enough to keep the cooling-loss cycle returning. Top-ups improved cooling for a while, but they did not remove the leak path.
Repair the service-port leak path at the valve core area, then confirm the system holds and cooling performance returns before discussing any larger circuit work.
The outcome
After the valve-core leak path was corrected and the system was rechecked, cooling stabilized and the repeat top-up cycle stopped.
Timeline
Day 1
Cooling loss returned after repeat top-ups
Day 2
No leak source was confirmed
Day 3
Leak path narrowed to service-port valve core area
Day 4
Cooling stabilized without repeat loss
What this means for you
Repeat top-ups without a leak source usually mean the diagnosis is incomplete.
- Cooling improves after top-up but fades again later
- You were asked to monitor without a confirmed leak path
- No clear source was shown after repeat visits
Ask for a leak-path diagnosis, not another repeat top-up, before spending again.
Same situation with your aircon?
Describe what's happening. We'll work out the likely cause and tell you the right next step.
Describe it on WhatsApp