Blower Motor Operates on High Only or Repeat Blower Resistor Failure - kw GMT800 GMT805 GMT820 GMT830 AC heater heat front air manual HVAC electrical wire high inoperative speed

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

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.

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.

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

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