Chirping noise at low revs and when engine is loaded

[soundboy10]

I have 3.0 and am getting a chirping noise at very low revs in 1st and 2nd gear, as well as at idle when the engine has been loaded with heated rear screen, lights, fog lights, heated rear screen etc. I think it's the belt or one of the pulleys, i was going to order the belts anyway, as i presuming they're not too expensive, and then order any of the pulleys if they feel wrong once the belt is off.

Can someone please just confirm, is it the AC belt and alternator belt that i need to order? And are there other names that i should be using that the dealer will know them by?

Thanks in advance.

 

[bcworkz]

Almost certainly just the belt. You can get exact part number for your car at http://www.realoem.com/bmw/select.do and drilling down through the choices.