The whistle is back..!

After the first head gasket change, Amy developed a whistle / whine when coasting down. I put it down to fan belt to start with. It went away after the second head gasket change didn't think anything of it - put it down to some sort of noise coming about as a result of the failing gasket somehow, rather than the fan belt.

Well, after 3rd gasket change (120 miles in) the noise is back. Definitely a toned "whistle" rather than a whine. Definitely on coast down - and more to the point when the throttle flap is closed. So the system is desperately trying to suck air in from somewhere else and any air leaks could cause a toned whistle exactly like that which I am getting.

Whats the common factor this time to the first time? Manifold issues. The first time I had sheared a bolt so I had vaccum leaks. That could cause a whistle. This time I have a cracked exhaust manifold around one of the fixings. So the crack not an issue, but could be causing some tiny leaks on the intake as not quite tight enough. Also reused manifold gaket. It was a bit tatty. So for the sake of £2.00 I'll fit the new one and see if that makes the noise go away! Hope it is NOT a sign of the head gasket going again, BUT still expecting that to be honest.

The nice weather means a lot of laid back weekend driving in Amy though. Despite the whistle, enjoyable and making the most of it!