If it starts and runs, it isn't blown up. However, I can't say what damage, if any, was done. If you have a leak behind the motor, check the heater core hoses, freeze plugs, and check for leaks between the heads and the engine block. Have someone pour in coolant while you watch where the leak is coming from.
Let me know what you find so I can further advise you.
Joe
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Tuesday, February 2nd, 2010 AT 3:32 PM