2002 STS - HVAC blower motor resistor pack
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 2002 STS - HVAC blower motor resistor pack in Past Cadillac Vehicle Discussion; Does anyone know where to find the "Blower Motor Resister" in the 02 STS? I have a feeling it's behind ...
  1. #1
    Silver66 is offline Cadillac Owners Member
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    2002 STS - HVAC blower motor resistor pack

    Does anyone know where to find the "Blower Motor Resister" in the 02 STS?
    I have a feeling it's behind the glove box thus needing to remove that to get at it.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2002 STS - HVAC blower motor resistor pack

    It's on top of the wiring pack under the flat wood part of the console - just in front of the shift stick.

    Pull straight up on the shift knob - it will pop off and smash your face. Carefully begin lifting the console wood trim from the rear edge. The resistor pack has a 4 or 5 pin connector that sticks straight up.

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    Ranger's Avatar
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    Re: 2002 STS - HVAC blower motor resistor pack

    I thought the blower speed was PWM controlled and resistors where done away with years ago. Color me confused.

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    Submariner409's Avatar
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    Re: 2002 STS - HVAC blower motor resistor pack

    Right out of the Helm manual, and the resistor pack is available at RockAuto or from Chris at Rippy.

    The resistor trace circuit board itself sticks down into the blower airstream and I would guess the electronically controlled speed selector switches different resistors in and out of the speed circuit.

  6. #5
    JimD is offline Cadillac Owners Connoisseur
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    Re: 2002 STS - HVAC blower motor resistor pack

    Quote Originally Posted by Ranger View Post
    I thought the blower speed was PWM controlled and resistors where done away with years ago. Color me confused.
    PWM speed control applies to the front seat area blower motor. The rear seat (auxiliary) blower motor speed is determined by resistors.

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    Re: 2002 STS - HVAC blower motor resistor pack

    Ahh, now THAT makes sense. Thanks Jim.

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    Submariner409's Avatar
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    Re: 2002 STS - HVAC blower motor resistor pack

    How 'bout that ????

    Now we need to differentiate between the "HVAC blower" PWM controls and the "Auxiliary blower" resistor pack. I went into the online manual and it took me to the "blower resistor assembly".

  9. #8
    Ranger's Avatar
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    Re: 2002 STS - HVAC blower motor resistor pack

    Now that makes me wonder why they used two different methods for controlling fan speed. I always assumed that there was some type of advantage in moving from resistors to PWM. If that's the case, why didn't they use that for both? Still somewhat confused , but less than before .

  10. #9
    JimD is offline Cadillac Owners Connoisseur
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    Re: 2002 STS - HVAC blower motor resistor pack

    Quote Originally Posted by Ranger View Post
    Now that makes me wonder why they used two different methods for controlling fan speed.
    The front seat temperature control has an AUTO function that can include fan speed. Allowing the AUTO setting to determine where the air is directed and at what speed, the HVAC control module can minimize temperature differences between the floor and the windshield. Cadillac comfort. Using PWM for blower motor speed control gives the HVAC control module an infinite number of speed settings instead of the 3 or 4 or ?? fan speed settings on a switch. Cadillac comfort without a drafty fan blowing in your face or on your feet.

    The rear seat passengers do not have the luxury of an AUTO function; they have to live with what they can get.

  11. #10
    Submariner409's Avatar
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    Re: 2002 STS - HVAC blower motor resistor pack

    Good info. Thanks.

    ........... I hope the OP really wanted "blower motor resister". I have both circuit diagrams if necessary.

  12. #11
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    Re: 2002 STS - HVAC blower motor resistor pack

    Ahh, the difference between first class and coach. Makes sense. Thanks Jim.

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