Question about 1996 GMC Suburban
I have a 95 suburban and it has a resistor module mounted to the heater plenum under the dash. It has a plug on the out side and 2 screws holding it in place. It is about 2x3 inches. It just looks like a flat plate on the outside. The resistor module has 2-3 resistors and it basically routes the power to the fan thru one of the resistors. The more resistance the slower the fan turns. That makes up the 3 speeds.
There is also a chance the motor is going bad and requires the full speed power to make the motor operate.
The resistor module is basically forward of the passengers left knee. If you know anyone with a meter, they could check it out for you.
If you have power at your motor plug on all 3 speed settings, chances are your motor is bad. You can get used ones from a salvage yard pretty cheap or buy a new one.
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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