05 Trail Blazer Vortec 4200 center pulley seems to have a bad bearing behind it. Is that a pulley or idler problem or is it a water pump issue?

check items like idler pulley bearings , water pump bearings , powers steering bearings, ac clutch bearings
check condition of the drive belt and tension

My dodge caliber 2007, makes a really loud noise what is it??? 3 mechanics 7 3 wrong diagnoses later, and Dodge Manufacture telling me it is not something that is a common problem, i found it.. first it was the bearing on the Ac Compressor (WRONG), then it was the idler pulley bearing (wrong), then it was the water pump bearing (wrong). It was the alternator bearing (YEP) 3 mechanics, 2 dodge corporate call, and finally self perseverance finally some one got it right... ME i ho

If you have gears it could be the pilot bearing...When they go bad they make a noise...But whatever it is it's moving motor speed

Sounds like the idler pulley. It is what keeps tension on the surpentine belt. Usually a water pump will start dripping water through a small hole in pump that opens when the bearings go bad and start to wobble. You can spray some lube on idler pulley to see if it quiets it down some thou this is not a permanent fix. It will pinpoint the problem

Hi Cro,Seems to me as if you may have a problem with your water pump. If your vehicle is loosing coolant, that will confirm it. With the engine off and the key removed from the ignition open the hood and check for any looseness in the water pump by taking hold of the fan blades and shaking back and forth (If they're plastic be careful not to apply to much force, or you may break them!). If there is play you'll need a replacement pump!Best regards Johngee10

The fan clutch is connected to the water pump. The harmonic balancer is the crank pulley. If the fan clutch/pulley the fan clutch is attached to is sloppy than the water pump is bad.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Hi, Have you checked your pulleys to make sure all are turning freely, and idler pulley center bearing not gone out .Take your hand and see if it has alot of movement in it like up & down or side to side , do the same thing to water pump they are bad about the bearing going out on pump. This will throw your belt off . If i can help you anymore feel free to re post.
Thanks dodge tec

Fan pulley loose,but four bolts that hold fan on are tight,like something is loose behind pulley on my 2005 chevy trailblazer/vortec 4200

click on x to openupper right corner with about 5 bolts

odds are the "growling" noise is a bearing on a pulley going out. Could be anything from altenator, steering pump, water pump, but most likely just an idler pulley. You need a mechanics stethascope to diagnose and then just need to replace the proper pulley.