I had this problem when my 2003 trailblazer was under warranty. I took it into the dealer twice to try and have them fix it. The first time, they told me there was a software patch to fix it. They said they put in the software patch, but it wasn't fixed. The second time I took it to the dealer, they said this noise was normal. Now, a little over a year later and outside the life of my warrenty, my fan clutch is really broken (refer to question on high fan speed error in a Chevy trailblazer for details on the problem I am currently having - which include a jet engine like noise caused by the fan because the fan clutch is broken) and I am waiting to get it into an independent shop for service.
I don't know if the ticking noise was really normal as the dealership indicated or if it was an early indication of the failure I am currently experiencing. Good luck. I am going to keep searching the net to see if I can find any additional info about whether this ticking noise is "normal" or whether it is an early indication of my current failure. I may even call some other dealers in my area to see what they have to say about the problem.
Wife and I bought a 2002 Trailblazer and would hear that clicking (or snapping) under the hood, infrequently. Took a trip this summer and truck started sounding like your jet or a turbo Peterbuilt. It WAS the clutch fan. Bought it at AutoZone for $199 and installed it myself
Visit www.trailvoy.com for a complete answer to the fan clutch change with pictures.
if you do not have no experience in fixing car, do not do it
The engine of a Chevy Trailblazer may begin shaking when idle if there is insufficient fuel reaching it. This can be caused by a clogged fuel filter or dirty fuel injectors.
When a clutch fan is always engaged, it could mean that the clutch is no longer working properly and needs to be replaced. If a clutch wears out, then it will make?æthe engine to run hot when idle.
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It sounds like your fan clutch is bad.