And stay away from "surefire" fixes from relatively obscure sources without a KNOWN track record.
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Parts website called GM Parts Giant.com has good diagrams to go with parts lists. I have the 5 volume Helm manual for my 04 and this is a heck of a lot easier way to familiarize yourself with the layout of a system. The manual is apparently for troubleshooting flow charts, torque values, and repair procedures and I have a hard time finding good overviews with diagrams.
http://www.genmotorinfo.com/Picture....100208TC00-644
Heres the link to the parts list....clicking the Get Info button brings up the diagrams....
http://www.gmpartsgiant.com/Page_Pro...&SubModel=2500 HD 2WD - New Style&mCode=TC25753&eCode=LB7&tCode=M74&RPO=Z88&ma jorIndexID=00&SupplGroup=80&minorIndexID=TC00-644&SortKey=113
Dont know why the whole URL is not copying as hyperlink, but you need all of the above string ending in 113....
Or just go back to the homepage and click on your vehicle, year, model, etc.