2005 GMC Sierra 1500 HD Questions

All 2005 GMC Sierra 1500 HD Questions

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Service 4wd light is on having the exact same problem as listed on a few of the reports, which sensor do you change?
WE DID BOTH, PUT IN A NEW BLOWER THATHAS A LIFETIME WARRENTY , REPLACED THE RESISTOR TWO TIMES , ALSO CHECKED FAN SWITCH. WAS OK AND WORKED ON ALL SPEEDS, AFTER ALL THIS ,FAN ONLY WORKED ABOUT A WEEK. WHAT NOW ????
i replaced the ignition switch, then the starter, and now it won't start. what can i do without an code reader to point me in the right direction as to whats wrong.
Do i need to have a device to get the codes from the compute to find out whats wrong? I heard theres a way to do it manually. Need to confirm that my timing belt is out. Is there any other way to know if the problem i...