coolant going missing

i own a 94 cavalier 2.2L and my coolant runs out about every 2 weeks.(out of the overflow.I have checked the oil and no coolant and no oil in th coolant i am really baffaled please help:grinyes:
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small crack in the overflow tank? did you take the tank out of the car and check the spot where the hoses connect? Any puddles under the car? Did you look at the weap holes on the water pump? Do you have heat that smells like antifreeze?

try to start your car with the engine still cold. Open the radiator cap and pour some coolant until it fells up. Wait until the coolant level goes low, if this happen, repeat step one. If this still keep on going, look under your car if there's any coolant leaks.