After the belt change and the pullys being cleaned at the dealer a few weeks ago I still have it. I too believe it is the clutch fan mech. It is temp related and rpm related. Now when I fire her up and it has been colder here in GA when I back out of the driveway the rattle sound is closer together and gets louder 2 min into the commute to work it goes away. A good way to trouble shoot it would be to remove the assy and fire the truck up for a few minutes overheating wouldnt be a problem if ran for 2 min or so. I wonder if the clutch fans are defective...since this is not normal. I wonder how much the assy is I would like to get a price from advance auto if it is cheap I might replacre it to avoid the 4 hr round trip to the dealer..they might re-emburse me as I have a real good repor with the hummer manager...shoot I got a bruish guard fro free due to all the troubles I have had.
If I had time I would yank the clutch fan mech. I wonder if the fan shroud has to come off...probably so but it might be possible to remove the mounting bolts and work the fan and housing out...
The removel of the clutch fan is easy..just need the time.
I am going to call advance now and se if they have an app for a colorado or perghaps the H3 juts for my information....then I will call the dealer and tell them the rattle is not gone.
The encoder has resolved the stab light 4wd deal and the washer pump is replaced and working...if I can get this rattle to go away I am set.
Still love this truck..
UNO
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