Quote:
Originally Posted by Dux
I too have the "bird chirping away furiously" sound.
It's rythmic and constant (not relatied to road speed and does not speed up), and only apparent in colder weather!
The noise stops when the car is warmed up.
Other than strapping the misses to the underside of the car I'm stumped!!!
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It's your blower fan. (the one in the A/C system) It should vary the sound at different settings. It is most likely the blower fan bearings starting to go south. Eventually you will hear it in all weather.
VERY, VERY common with BMWs over the years as they age. It happened at the highest speed setting on my 1980 BMW years ago.