Water Boiled for faul belt..help

[elisluna]

Water Boiled for fault belt..help
Yesterday after 1h in higway I have heard a buzzer..and the missing water signal on.
I stopped immediately at the first parking (after 1km).
The water on overheating  boiled,with a few steam coming out from the plastic water plat (white plastic in front of radiator).
Immediatly I have think.."radiator brake"..but after looking better:the fan belt out of pulley (I don\'t know why..it\'s new,4month)
After cooling I have add water,and the water exit I think about 2liter.
Now the car start with no problem,no smoke from engine and no smoke from exhaust.but I\'m very very scared.

The motor It\'s was perfect,with pefect compression (between 8.5/8..
I\'m scared, I\'m afraid that the engine is damaged, how can I control it? What \'damage  can be happened at the engine?

2 things are incredible...the belt coming out from bulley ( but I think the alternator belt are weak,and the vibration make fail the fan belt).
And the lancet (pointer?) of temperature ever at half.:reallymad

The buzzer (normally you can hear  7000rpm) at 4000 It\'s  worst and terrible sound.


Sorry for my english. ^_^

[m1tch]

Are you still running your airpump? The coolent buzzer might mean the level is low, can you see any leaks?

[elisluna]

Yesterday I changed the radiator water and the belt.
I understood what \'happened,the bolt that adjusts the height of the alternator was broken, the alternator has dropped slightly...and the belt  was soft... with vibration the other belt have blown up.
When the water was down ,the signal of low water was start with buzzer , but the signal of water  temperature was always in the middle ,at half ( I\'m sure the water was over 212 °F).I suppose it broken?But for now works fine..when starts is low and after some minutes go at half.
For now nothing wrong, no smoke or steam..
But,however can I have damaged the engine?
How can I check?