2006 Chevy Express Aux Fan only high speed - resistor?

2006 CHEVROLET EXPRESS
75,000 MILES • V8 • 2WD • AUTOMATIC
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2006 Chevy Express 3500 12 passenger van: HVAC auxiliary rear fan only operates in high from both controls. Is this caused by a defective resistor module? Where is the auxiliary fan resistor assembly in the vehicle?

I have found a couple of vendors that advertise an ACDELCO Part # 158623 as a Rear Blower Motor Resistor. Is this the correct part number.

Is there a wire harness between the switch assembly and the resistor? If so, any recommend part numbers for repair if wires were overheated?

Is a wiring diagram available?

Any other thoughts would be appreciated.
Apr 29, 2011 at 12:13 AM
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SATURNTECH9
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I posted the diagram how to remove the rear aux resistor.This is a manual a/c meaning you don't set the temp you want it to cool too?
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Apr 29, 2011 at 12:38 AM
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There is a temperature dial on the control pannels. However it is just a warmer/colder dial (blue/red) like the main front panel
Apr 29, 2011 at 7:52 PM
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SATURNTECH9
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You need get to the aux blower motor resistor and put the switch to med and see if you have power to the light blue wire terminal c at the resistor card.Let me know what you find.
Apr 30, 2011 at 6:12 PM