[san rensho]

Like runjmc said, check if there is oil in the coolant or coolant in the oil. If there is oil in the coolant, don't panic, it could be a failed oil cooler which is any easy fix, except for cleaning out the cooling system. If there is coolant in the oil, that's not good.

Take off the serpentine belt and crank the motor by hand. If it binds, then you have a major problem. If not, take out the spark plugs and see if coolant is in he cylinders, if so you have a major problem.

If you don't have any of the above problems, then it could just be the car overheated and barfedcoolant. Fill up he coolant reservoir and see I it starts. If so, check the cooling system for faults. Hopefully it's just a waterpumpmor a cracked coolant reservoir.