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Originally Posted by Simon W
Update - Residual Pressure Test
TC - I redid the test late last night (i.e. ran the engine for 30 mins).
I've just taken the tank cap off and there was a very slight hiss (engine completely cold).
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A very faint sigh can be normal, but a sound like a pop bottle hiss would be concering. Can you repeat this test, but revving the engine to 3000 for 30 secconds every five minutes or so? Of course you musn't release the cap for 6-8 hours or till next day.
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On mine, there's a definite point where something suddenly changes and the coolant gushes out of the expansion tank at an alarming rate. It'll flood the complete tank rim very fast - much faster than I can turn the engine off.
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I'd suggest you do the textbook bleed/top up and then repeat this test. The coolant shouldn't become pressurised in this manner unless it's overheating/airlocked/pumped (exhaust).
TC