Quote:
Originally Posted by infernosg
Bottom line: is there any way this could be attributed to a bad thermostat or leaking radiator/water hoses? If not, like mentioned above, it looks like rebuild time.
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Not the thermostat, since it's an internal part. But in theory, if water can leak out of an extrenal part exposed to air such as a hose or radiator, then air can get in too. But you tested the system with the pressure tester and it passed, most likely you would have found a leak. Only exception to that I can think of is since the pressure test is done under static conditions (engine not running, at whatever temperature it was at when you tested it), the test could miss a leak that only occurs under some combinations of dynamic conditions (i.e. temperature cycling, vibration, etc.).