I took my blazer in because my instrument cluster failed, they replaced it, and we noticed around 1500rpm it would make a noise I can only say sounds like a cow mooing. We complained, and left our TB with them for over a week, and they say they tried 6 different instrument clusters and all of them made the same sound. I find it hard to believe that all GM remanufactured insturment clusters make the same sounds. The sounds is driving me nuts, any answers?
 
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