Quote:
Originally Posted by aerobod
A coolant cap that allows steam to escape due to the pressure release mechanism in the cap not holding full pressure is often the culprit, but there won't be any liquid present, just a small whiteish trace of residue. The system pressure test won't detect it due to the cap being replaced by the pressure test device.
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They said they looked for residue and didn't find any. I didn't see any either.