My X5 has been doing this for some time now but, when the car is idling it has a squeaky sound ( when I put it in drive its even louder than when in park) I know its not the belts I replaced both of them when I did work about 7 months ago (water pump & thermostat).

Now that we are having cold weather like 30° or colder it makes a odd sound on cold starts sounds like belt or something related and then it makes a moaning,whining sound then once it warms up it goes away. Only does this when its really cold.

Im leaning towards pulleys and belt tensioner.

Anyway have any suggestions?

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2003 BMW X5 3.0 E53
200K