Blower fan not working

General Motors has a special coverage to repair this condition. The resistor gets hot and melts the connector. You are almost out of coverage by mileage. Here is the letter sent out. Make an appointment to get it repaired free of charge.

2003 Chevy Truck C 2500 Truck 2WD

Â

V8-6.0L VIN U

Â

Â

Campaign - HVAC Blower Not Fully Functional/Inoperative

Vehicle Heating and Air Conditioning Technical Service Bulletins Campaign - HVAC Blower Not Fully Functional/Inoperative

CAMPAIGN - HVAC BLOWER NOT FULLY FUNCTIONAL/INOPERATIVE

Related Links

Owner Letter

Owner Letter

Dear General Motors Customer:

As the owner of a 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; or 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicle, your satisfaction with our product is very important to us.

This letter is intended to make you aware of a condition that may affect your vehicle. The relay resistor module (which controls blower motor speed) and/or the wiring connector that powers the module may overheat during sustained blower motor operation, or if moisture and other contaminants contact the internal circuit of the module. These occurrences may result in an inoperative blower motor, or result in a blower motor that functions only on certain settings. This may be accompanied by a burning smell or smoke.

Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the condition as described above.

What We Have Done: General Motors is providing owners with additional protection for this condition. If this condition occurs on your 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; or 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicle, equipped with a manual HVAC or heavy duty heater, within 10 years of the date your vehicle was originally placed in service or 150,000 miles (240,000 km), whichever occurs first, the condition will be repaired for you at no charge. Diagnosis or repair for conditions other than the condition described above is not covered under this special coverage program.

What You Should Do:Â If you believe that your vehicle has the condition described above, repairs and adjustments qualifying under this special coverage must be performed by a General Motors dealer. You may want to contact your GM dealer to find out how long they will need to have your vehicle so that you may schedule the appointment at a time that is convenient for you. This will also allow your dealer to order parts if they are not already in stock. Keep this letter with your other important glove box literature for future reference.

Reimbursement:Â If you have paid for repairs for the condition described in this letter, please complete the enclosed form and present it to your dealer with all required documents by January 31, 2013, unless otherwise specified by State law.

They will replace the resistor and splice in a new connector. Below is the part numbers of the parts you need. There are 2 resistor part numbers. Order the one that applies depending if you have A/C or not. Replace the resistor and cut out the old connector and splice the new one in.

Hi,

Joe from what I am reading you only have 6 volts on the red wire, This is not good you should have a full 12 volts, It is possible you have a loose or corroded ground wire. I am sending you wiring diagrams of the heater blower motor and the main ground location the links are below. Please look at them and please let us know if this helped you and what fixed problem.

Thank you,
Joe Terwilliger

Hi,

Joe, the G200 ground wire should be on the drivers side front door pillar but I want to be sure what heating and air conditioning unit we are working with is it manual or automatic. It will make a difference in the wiring system. The first wiring diagram below is for the manual system. With the key in run position not running should have 12 volts at the red, orange, and purple wire and to both black wires I highlighted the wires for you. The second diagram is for automatic heating and A/C control and there should be 12 volts at the red wire to black wire connector C but the purple wire with a white white stripe and the solid purple wire voltage may vary because voltage for these wires are controlled by the heater control module and the heater blower motor processor. It could be a faulty control module behind the center dash or blower motor processor right lower dash were resistor should go. Please let me know if this info is helpful and if you need any more information.

So you have power and ground and replaced the controller blower motor and resistor, there must be a wiring issue. here is a guide to help you with the wiring diagrams for the system enlarged so you can read them. Check continuity to ground on all none ground wires.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please run this test and get back to us.

The blower motor circuit is a isolated circuit if the ABS light is coming on the problem could be a voltage drop at the junction block. Check the orange wire C2 terminal A for a voltage drop at the IP fuse block (it's the big wire) this wire runs from the ignition switch to the back of the IP fuse block. You will need to remove the block to access to the wires. Check the back of the fuse block for burnt or melted wire or wires. I'm attaching wiring diagrams and fuse block locations below. The wiring diagrams are into 2 hafts for easier viewing. Please let us know if this was helpful.

Thanks
Joe T.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.