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Sorry I was reading the thread when you posted this initially. Where is the hot air coming out of defroster/vents/floor? Are your controls vacuum or cable operated? ~Michael

I agree with 67Dart273. Sounds like you have a blend door that is broken/disconnected or otherwise not working properly. The quickest and easiest repair is to install a manual valve into the heater inlet line and shut off the hot water flow to the heater core. To repair it properly you will need...

This makes the most sense. If the belt fell off at 4000 rpm and hooked on the fan it could easily have caused the blades to snap off. It could also have been the reason for no additional damage. ~Michael

Snake; To answer your question a faulty radiator cap can create the problems you described. Water boils at different temperatures depending on the pressure it is under. A radiator cap rated at 15 pounds will raise the boiling point approximately 30 degrees. As the water temp rises the pressure...

TrailBeast; A 195* degree thermostat should maintain an average engine temp of 175* with a good cooling and air circulating system. Remember that it isn't like a light switch on/off. You have a bypass hose and most likely a bypass built into the T~stat as well. 195* is the full open temperature...

Can you post some pictures so we can see the design? ~Michael