I have an 03 Trailblazer LTZ just under 200,000 miles it is making a noise in the front of motor area that reminds me of a rock tumbler. The noise is constant from the time I start it till I turn it off and seems to get worse each time I start it. Fan does wobble a little bit.

 

fan shouldn't wobble. if its a 5.3 with a fan clutch the water pump maybe bad...post a video. remove the belt and spin all the pulleys

 

My 93 did this and it was a loose pulley on the crank

 

Thank you very much, yes it is the water pump.