Recently, my little 4 banger has started acting a little funny. If I had to guess, I think my Water Pump may be on its way out. At idle, I have this increasingly louder rattle/scratching noise that I believe may be the bearings starting to wear.
Also, it whines while accelerating. It hasn't been running hot, nor has any coolant leaked, but I have noticed a hit in MPG.
Are there any tips, or important things I should know dealing with a water pump?