I can only be a wild guess but the transmission could noises, power steering could make noises and anything that spins with the belt and you might have coolant leaking. Look - see - some fluid level will be low.
You said you couldn't see it and you are there. I'm here so that's a double disadvantage!!
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/