I have two problems. This takes place in the Lakebed Temple (Temple 3). One I have done what this guide says to get the last Piece of Heart before the Boss, but when I pull the lower western handle, the water doesn't actually flow to the western side, as I don't think any water is flowing from the east.
My other issue, is I can't find the Boss door.. I've looked through the dungeon complex a couple times now without any luck. I HAVE the Boss Key.
Quoted below is from the GameSpot guide:
Originally Posted by GameSpot TP Guide