I would say it's the water pump. It is run by the timing belt. It isn't a fun job, but you don't need to pull the engine or lift it. If I recall, you will have to support the engine so you can remove a mount.
When you do it, replace the timing belt too. Make sure to get a good waterpump. Don't get a remanufactured one because you won't want to do it again.
Let me know if you have specific questions or help with anything.
Joe
SPONSORED LINKS
Monday, December 7th, 2009 AT 10:04 PM