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2007 Yukon Denali / 2009 G8 GT
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347 Posts
I had a bad whine recently and low coolant. The dealer replaced my water pump and I was pleasantly surprised to see it helped with my whine. There's a bulletin on it.
However, I still have a whine that is quite bad in 5th at 64mph even though I told my dealer about that too. Of course this wasn't written on the RO so they tell me the noise is my exhaust, yeah right. They didn't accelerate at 62-65 in 5th.
Good luck.
 
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