Ive just developed a new problem with my C230K 1999. Now, being very cold here in Canada, im thinking its just the cold making the car make noises. But, when its parked (outside only) for a good 8hr stretch in -15 temps, there is some squealing/screeching strain coming from somewhere in the engine area. Its not loud but its there. You need to turn off the radio to hear it! But, it has never done this before and im at 101,000kms.

Would this be water pump?

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99 C43
98 S420
99 C230K
01 C240