Originally Posted by Doru

The leak at the lower radiator hose - where the temp sensor is mounted, might not be obvious, because if this is the spot, it leaks consistent, so no white residue will be seen. Also, it will leak while driving off (when the coolant is still cold, and the O-ring didn't expand), so there might be nothing under the splash shield. Run your finger around that spot. If it's leaking, you feel moisture. If that's the problem, it's an easy and a 2-3$ fix.