1999 Corvette front right engine compartment, something constantly quietly running with ignition off

by Jeff
(Ontario Canada)

I have a '99 c5 that has the noise comparable to a small fridge running, coming from the front right area of the engine compartment. It seems like it's coming from under the front left edge of the coolant reservoir, between the rad and reservoir. At least that's where it seems to be coming from with my hearing. It's a faint noise and it has to be quiet(early morning in garage)to hear it.
I can't see anything around that area that could make noise and hope someone knows what it may be.

Thanks, Jeff

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