Which drain hose? It probably has a loose clamp or if it is older than 8 yrs, maybe it has a hole or cracked. If you can see the dripping, you have isolated the hose. . follow the hose to its connection to determine if it is a loose clamp. be careful...engines get very hot. Remember A/C drips water constantly. It is condensing water from the humidity in the atmosphere. It is located near the right/front corner of the car. If that is where a clear water puddle is formed...its okay.Have a mechanic check it out if you are still in doubt.