I recently replaced my water pump because I had coolant leaking on the front side of the engine and running down the front of the oil pan drain pan. The leak on the front of the oil pan has been eliminated. Now I have coolant leaking on the right hand /passenger side of the oil drain pan. Are there any coolant hoses that run on the lower part of the engine on the right hand side? I see the two lines for the heater core, but those are dry with no signs of a leak. I only loose about a cup of fluid at a time. I have read many posts about the valley hose. Is there any chance this could be my issue? Does the valley hose leak only when the system is under pressure. My car seems to leak once I turn off the engine. Any ideas?

 

The valley hose leaks into the valley and down the back of the engine.

 

Further to Meirion1, you will most likely see a puddle behind one of your front wheels if it is the valley hose; on mine it was behind the driver's side wheel?