Quote:
Originally Posted by T-Cut
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.
TC
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It's more of a sigh than a bottle hiss. Anyway, I've just done the above test (engine to 3000rpm etc.) so I'll take the cap off tomorrow and see what it does this time.
Quote:
Originally Posted by T-Cut
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
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Ok, I'll do a bleed/top up after seeing (hearing) what happens when I take the cap off tomorrow.
NB. If I turn the engine fan off (via Demist button) or switch the engine off I can hear some faint gurgling going on behind the centre console.