fan is loud and runs continuously

I had a small water spill - top left side of the keyboard. After letting it dry out for a couple of weeks, it would run with the magsafe cord attached, but only if the battery was removed. With great advice from this forum, I replaced the MagSafe DC-in board (the old magSafe Board DID have some white corrosion on the underside) and everything now works fine, except that the fan is loud and runs continuously - it didn't do that previously. I am so extremely happy to have my macbook up and running again that I can live with the noisy fan, but wonder if I should try and fix that too. Will it hurt anything to just leave the fan alone? Any advice on what to do next, if anything?