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2005 GMC Sierra 1500 HD Questions

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It only comes out in the defrost mode
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 is the timing belt?what other problems have symtoms similar to the timing belt. thanks!!
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