It may be your Water pump, but if it was leaking you would notice your car heating up. If you recently had a waterpump installed, the gasket may have been put on incorrectly and in turn caused it to leak. But it would leak all the time as long as engine is running. You should make sure none of your hoses are leaking, and also make sure it is antifreeze. You may try tasting a very small amount by touching it with your finger. If it tastes sweet then its antifreeze if it tastes like water then it may just be condensation from you airconditioner running. But make sure you just taste it and dont ingest any of it.
