GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello I will help you with your question,
Do you have a voltmeter or 12 volt testlight to check the circuit if I guide you?
Great, let me know if you have 12 volts at the red and orange wires at the blower resistor next to the blower motor.
This is which model of 2003 GMC?
Find the BLOWER fuse in the underhood fuse block and be sure you have power at its feed pin.
The red wire comes directly from that fuse through the instrument panel fuse block so we need to check both places,
You are sure the meter works? You tested it on the battery?
By "there" you mean at the fuse?
Good I will get you a diagram of the right end instrument panel. The red wire goes through it so you will need to see if you have voltage in and voltage out. That red wire runs from the panel to the resistor from there.
Look in the "d" pin position for the red wire on both these >Click< You should show 12 volts at both large red wires, If you have 12 volts in but nothing out the fuse block is open inside. C1 is power from the underhood fuse block.
Let me know what you find
The recall is out of date and no longer in force. It is 10 years from the in-service date of the warranty, that was 3 years ago that it expired for your vehicle
Can I help you further with your issue or have you decided not to test further.
The problem is you don't have power at the red wire at the resistor. You do have power at the fuse, the only junction between those two points is in the right fuse block. You told me you do not have power to the resistor at the red wire/ That is not the fault of the resistor
Let me know if you want to continue