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[Webby the Bear]

I thought the sensor would send to the ecu but wasn't sure.So if the ecu gets the signal that the temp is way out of range i.e.overheating shouldn't it take steps to protect the engine,shut it down or something?

That's why there's a head gasket  designed to be the first thing to let go before engine damage.

Surely it's more of a necessity to keep the oil and water in their respective jackets when the head and block are separate? After all, with an aircooled two-stroke engine you can lap the head and cylinder block together and eliminate the head gasket.

Yeah thinking about it it doesn't make sense. But I w as definitely told that so blame my college 

[baggers]

Cylinder head gasket is there to do a job like any other gasket "seal", this gasket has to seal three separate chambers.
To design a HG to purposely blow when overheating in most cases would cause more harm to the engine.  It's just that the engine overheats metals expand head becomes warped, gasket blows.  If everything works as it should in the event of overheating this is where the rad cap has a duty, allow the excess pressure to blow off hopefully protecting the engine and for us to notice the temp gauge has just blown off the scale, unfortunately this can sometimes be to late.
In some cases overheating occurs because the HG has failed but not because of pressure just age/fatigue.

The last thing you want is to purposely blow a gasket that is knowingly going to mix oil and water and/or allow water in the cylinder with a chance of steaming the top of the piston or causing hydro-lock.

[Marks DTM Calib]

I thought the sensor would send to the ecu but wasn't sure.So if the ecu gets the signal that the temp is way out of range i.e.overheating shouldn't it take steps to protect the engine,shut it down or something?

That's why there's a head gasket  designed to be the first thing to let go before engine damage.

S'what I was told in college 

More often than not its not the head gasket that goes as a result, its a warped head or cracked block........