For any vehicle...Check your owners manual first and look at fuse diagram for heater fan blower. If fuse bad replace. There maybe also a fan blower relay in fuse box listed as well. You can replace those cheap. You may have an exact relay in fuse box for another system. If so borrow it and put in place of fan Blower relay plug in. Try fan... If No..Check connector wire to see if it has power. If no...fan turn on switch is bad...You could also run hot wire right from positive on Batt to fan blower motor. If blower works...your fan blower switch is bad...If no...your blower is bad...junk yards cheap...might as well get new one from auto store.
Smack it and see if it comes on. If it does then the motor brushes are bad. If it does not come on, check the fuses. If the fuses are ok, check the voltage on the plug to the motor.
http://technoanswers.blogspot.in/2012/04/how-to-remove-fan-clutch-on-2005-gmc.html
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This will help.
Thanks.
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