Coolant pressure test

[Oldmactech]

Getting frequent low coolant level light and borrowed a tester from Autozone. Injected 10 PSI and walked away for 5 mins and it was back to 5 psi after seeming to hold at 10 for 2 mins. Not hearing any air release or seeing any coolant escaping although I haven’t pulled anything off the get a better look.

Question: how much pressure gives a fair test? 10 psi enough?

3.0 inline 6, good places to suspect leaking?

The leak must be very small, maybe even a bad sensor as the level indicator is at the top when I pull the cap.


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