Like Trekker said, does the sound vary by engine speed or road speed? If it is, in fact, a whirring/fan sound it may just be the blower fan under the dash board. Every now and then, mine will come in contact with something and make a ticking sound until whatever it was gets out of the way. Maybe the bearings on the blower fan are going out and that is what's making the noise.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless
Reply With Quote