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Discussion Starter · #1 ·
Dear Team,

The whining noise from the front of the engine of my 2007 Nitro has dictated me to do the following.

Change Water Pump
Check power steering and change fluid
Check Belt
Check Alternator
Put car on computer: nothing to report

What I did not do:

Check is AC is making the noise

Disconnect the serpentine belt from the AC and run a smaller belt to see if it is still making the noise.

I am open to any suggestions Team.

My Sincerest Thanks,

Rob
 

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Possible bearing issues:
  • alternator pulley
  • power steering pulley
  • water pump pulley
  • AC clutch pulley, AC clutch itself, or AC compressor
  • tensioner pulley
  • idler pulley

Do any of them have any run-out or any play on their shaft?
Do they spin freely by hand?
Does yours have the electric or the belt-driven fan?
The tensioner and idler pulley can be replaced as a single unit together, or just the pulleys can be replaced.
I replaced mine entirely recently given my high mileage.
Could be the power steering pump itself.

Could also be internal with the timing chain becoming worn and loose--might be time to replace it and the guides.
 

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Discussion Starter · #4 ·
Dear Team,

thank you for getting back to me.
The sound does increase as RPM’s increase.
I like the stethoscope idea, I’ll do that next.

Any other ideas I’m open to suggestions.

I was thinking of replacing the belt with a smaller one and divert turning the ac to see if it makes any noise.

My Sincerest Thanks,

Rob
 

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Wheel bearing I had same problem . You could jack it up and spin wheel could tell anything was wrong took wheel hub assembly off spun it and that's where my whining that increased with rpm came from. Don't hurt to check may be what ur hearing. Good luck
 

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Dear Team,

thank you for getting back to me.
The sound does increase as RPM’s increase.
I like the stethoscope idea, I’ll do that next.

Any other ideas I’m open to suggestions.

I was thinking of replacing the belt with a smaller one and divert turning the ac to see if it makes any noise.

My Sincerest Thanks,

Rob
then replace the idler arm while your at it. one bolt and cheap
 

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Don't understand.

Does it increase when you're in P or N? Or only when you're driving?

If the latter, put the SUV on four jackstands and put it in 2WD. If no noise then 4WD.
 
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