There is a squeaking/chirping sound coming from the vicinity of the water pump on my 2002 FWD 5Sp RAV with 50K miles on the clock. I put a can of water pump lubricant made by Gunk (that name does NOT inspire confidence) and the chirp went away for a couple of weeks then came back. My question is, how long do the pumps tend to last on these cars? There is no bearing rumble or other ominous sound, and no leakage coming out of the seal area. A year ago when I changed the antifreeze I put the 100,000 mile stuff in thinking I would change it less often than the two year recommended interval. Has anyone done this with the thought that it would require less servicing?