Question about 2005 Chevrolet TrailBlazer

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Vortec 4200; pully connected to fan is wobbling

I have 2005 Trailbazer with Vortec 4200...just started making noise; noticed pully attached to fan is wobbling...tighted bolts...still way loose. Is that the water pump? If so how easy is it to replace?

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  • Anonymous Feb 28, 2009

    same as above. except mine is spraying out coolant

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Posted on Sep 28, 2008

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4 Answers

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check the idler/tensioner pully's and the alternator pully, there is a common problem with one of these 3 going bad, usually an idler pully the best way to check is to get a mechanics stethescope and touch the end to the bolt on the idler pully's you will notice a very distinct sound difference from a smooth pully and one with bad bearings. gm tech here, seen many of these

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I believe that the part your'e talking about is the clutch for the fan. It is a two piece unit, factory assembled. likely the bearing inside failed and caused this. You can change the fan and clutch unit, inspect everything for damage from the fan becoming disconnected and be OK, however running and wobbling may have caused some bearing damage in the pump...keep an eye on it...any noises or leaks from there, change it.

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1 Answer

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