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 ...
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.
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.
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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 .
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.