When leaks are small, and leak only under pressure, only vapor escapes, leaving no trace on the floor. Check for vapor / rust stains in the cooling system. Also check for a whitish color on engine oil (dipstick) , for leakage of coolant into the engine block.
It may be your head gasket is bad. This would allow coolant into the combustion chamber and/or oil pan. A couple ways to determine this: check the oil level, if it is too high, you may be getting coolant in it, also, the oil on the dipstick or when drained has a 'milky' white-ish look to it. Check the exhaust after the car warms up, do you see white exhaust smoke? This also indicates the head gasket is bad.
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