My fan switch in my 03 only works on high and doesnt blow at any other setting, fuses are good, is the fan switch bad? Thanks for the help.... :)

Probably the resistor and or connector to the resistor.

Subject: Blower Motor Operates on High Only or Repeat Blower Resistor Failure


Models: .




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The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
Customers may comment that the A/C blower only operates on high or repeat blower resistor failures. Cause is a mis-positioned harness from the blower motor assembly to the right I/P fuse block C4 causing harness rub through at right I/P metal support.

Recommendation/Instructions:
Repair wiring and reposition blower motor harness away from the right I/P support. You may also want to insulate the I/P support bracket with foam tape to prevent any future concerns. Refer to SI Document 885398 for further details on wiring schematics for this circuit.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:
(03-05 Chevrolet All Full Size Trucks And Utilities) and (03-05 GMC All Full Size Trucks and Utilities)

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GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© 2008 General Motors Corporation. All rights reserved.

Thanks for the info, I will check it out.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". Hahaha, lol :rolleyes:

http://www.dieselplace.com/forum/showthread.php?t=161533&highlight=resistor
http://dieselplace.com/forum/showthread.php?t=101328&highlight=blower+resistor+bac