When did this start hapening to you? what did you do?
for me it was after i did my timing belt and water pump...
Its not because the belt is new, and its not because its loose... the belts are made for that purpose, no need to over tighten them, you are just looking for worn out seals, bearings and leaking water pump. i made that mistake before.
Take a look at your water pump pulleys, there should be two of them, the outside one can be put on two different ways, and one way just puts it off by 2mm or so off to the side, which gives it just enough to start squaling like a $2 hooker...
Try that and let me know if it works since your car is already running.
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