Haven't had this fixed yet but just wanted to say I figured out what the squealing noise was!
It's water/steam escaping from the gap where the hose has split and a temporary repair has been made. That's why it only happens when the engine has warmed up and stops when the whole thing cools down. Basically when the engine gets up to temperature, the water I'm currently putting in the car until I get it fixed is heating up and boiling off I guess and escaping through the hole. The flapping tape around the hole is causing the change in tone of the noise. Checked it this morning by putting something around the area and trying to clamp it (not easy when its super hot!) and the noise would change or stop depending on how I covered it.
Will have it fixed tomorrow and then drained and replaced with proper coolant/antifreeze.
Had a look around and nothing is jammed up anywhere. Started the engine and watched the pipe and water is clearly leaking out of it. I'm just going to have the pipe fixed and then see what happens after that.
Does anyone know what that particular pipe is called or what the part number is? You can see in the picture in one of the previous posts it's the pipe located directly underneath where the coil pack is mounted
Thanks. I didn't check the coolant because the AA mechanic topped it all the way up before he left but having just checked it I can see that it has drained away somewhere. I topped it up again and the heating is working now although after a quick 5 minute drive the coolant seems to have leaked out again...guess I'll have to just keep water handy for the moment before i can get it repaired properly.
As for the repair, the mechanic said the tape would hold until I could get it repaired but it appears that it's still leaking. Here's a picture of the temporary repair he did....
It was wrapped really tightly but seems to be undoing itself and you can see condensation there as well so looks like there is something coming out.
Might be a stupid question but doesn't the belt stop when the engine does? If so then why would the squealing sound continue after the engine has stopped? And if it is the belt then is there a way to get the coolant off the belt?
Oh and just thought I'd add a sound clip of the noise.