SOURCE: Blower won't shut off
You will need a Blower motor resistor and maybe a blower motor resistor connector end. If you look under the dash on the passenger side(may need to remove smooth black cover, vents will be sticking out) you will see a connector going straight up into the blower motor resistor(7 wires/slightly in front of blower motor). Pull out the connector and check for melted terminals/wires. If no melted terminals just replace blower motor resistor with part # 89019088 per GM to revert to part before 04 in order to stop blower motor resistor relay from hanging. Let me know if i can help more.
SOURCE: blower motor makes loud noise when on high
I have a 2004 dodge ram 1500 with the same problem, vibrating blow fan when on high, pulled the blower fan out and found a piece of the hinge from the recirculation door and felt the recirculation door sitting up on the vent of its hinge. Crappy engineering once again.
SOURCE: 2003 gmc 2500 hd..horn doesn't work
The horn pad is made of vinyl which contracts through the four seasons causing this problem for some. Remove the horn pad with the battery disconnected first of all. Use a jumper wire to see if the horn works. If id does check the horn relay next. If ok hot wire the horn direct. One should be your problem or it is a broken wire instead
SOURCE: 2005 GMC 4x4 HD 2500 6.0 eng. rear axel seal
SEAL COULD BE LEAKING CAUSE YOU DIDNT LUBRICATE THE SEAL LIPS WITH PETROLEUM JELLY TO HELP THE THE SEAL LIP SEAL OR YOU DAMAGE THE SEAL WHILE DRIVING IT IN.AXLE FLANGE NUTS TORQUE IS 58 FT LBS THE AXLE HUB NUT TORQUE IS 177 FT LBS.
SOURCE: 2006 gmc sierra 2500 duramax, Heater blower motor
could be the blower motor relay orthe blower motor resistor
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