Andy, which car is this?

Yes, there is a coolant pipe on the firewall side that is connected to the turbo. Yes, you probably killed the head gasket. Steam on the inside of the windscreen is a leaking heater core. No, the aluminum heads do not generally warp.

You are looking at a large job due to the heat buildup. I suspect the heater core broke because of the head gasket failure creating too much pressure in the system, not the other way around. That pressure and high heat (steam) could also blow the O rings on the turbo coolant pipe.

What caused the deformation of the coil disturbs me the most. That would be tremendous heat which might have caused additional damage.

Finding a 245, 745, 945 is tough in your scarce market. A Toyota is much easier to find, not fun to drive, reasonably reliable, and more mechanics know how to work on them - parts are also easy to get.

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My back feels better when I sit in a Volvo seat