Help!! Have a howling or whining sound coming from the front of the car -- 2008, 3.2 L, AWD. I have replaced the power steering pump (leaking fluid) the vacuum booster pump (leaking oil), tensioner pulley and idler pulley. The car has 127k miles and these repairs were needed anyway, but I was hoping they would fix my issue. The engine
sounds pretty good when the car is in "park" but the sound I hear......I think.....is coming from the either the front or rear differential, the wheel bearings, or axels.
Here is an overview of the sound and when I hear it:
1. "winding up" sound on acceleration from a stop
2. howling sound when on the highway. Seems to be the worst over 30 miles per hour. The sound is almost non-existent when going down hill at high speeds and when I let off the gas
3. The howl/whine is very noticeable at low speeds, through parking lots.
4. The sound seems to be tied to the rotation of the tires, not to the rpm's of the engine.
Do you have any idea of the parts I could narrow the sound down to? I can diagnose because the car has to be moving to hear the sound. Any help would be great! Thanks in advance!!