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Posted on Jan 02, 2017
SOURCE: 2003 differential whine/noise
The last time I had a hum coming out of the area of the differential it was an inside axle bearing going bad. In my case there were four bearings (one on each end of each axle). It was a Toyota. We changed one bearing after listening very carefully and guessed right. I don't know if Cadillac is built similar in this regard but I'm thinking it may be. It was a speed sensitive hum sound like you describe.
Posted on Dec 27, 2008
SOURCE: Whining Noise
Hi, this sound is most likely coming from the power steering pump. I would first, check the power steering fluid level to see if it is full. if its not at the full mark, add some fluid. If the fluid reservoir is full upon inspection and the whining continues, the pump may be damaged and the pulley on the power steering pump could be slightly out of sync with the pump housing.
The second issue could be belt slippage. i would do a tension check on the drive belt and pulleys as well. make sure there isn't any ware and tare on the belt and make sure the tension is to specs.
Please rate and god bless:)
Posted on Apr 15, 2009
It's probably the power steering motor. I've got a 2006 T&C and the power steering motor started whining quite a bit. I first noticed it after pulling off the freeway after driving for over an hour or so. It then progressively got worse and I feared the motor was going out. I solved the problem by over-filling the power steering fluid reservoir. It showed full, but I over-filled it by adding about 1/4 quart of extra fluid and the motor noise immediately stopped. I also read posts about the reservoir cap being the culprit if it doesn't get a good seal. Good luck, and I hope I got this to you before you ended up spending unneeded $ on anything!
Posted on Mar 20, 2010
Another place to look is your IAC, or Idle air control valve. It is bolted to the back of the intake manifold, and can be removed and cleaned. It is usually the cause of most Honda Idle problems.
Posted on Apr 18, 2010
Ring and pinion noise for sure,yes. Check for play right at the yoke where the drive shaft goes in.
I've seen a few fords where the pinion nut was loose and after re torquing they lasted another 100,000
Posted on Jan 08, 2011
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