Heater blower resistor is what controls the low medium high speeds...
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In general the heater blower motor speed resistor is located in close proximity to the blower motor.
The heater resistor coil is located on the blower motor on the 2006 T300 Kenworth.
the heater blower resistor is located on the passenger side footwell near the firewall. a complete how-to replace the resistor, along with photos is available on newcougar.org http://www.newcougar.org/forums/how-tos/3732-fixing-heater-blower-resistor-install-photos.html
heater blower resistor has to be replaced. you have to remove glove boxthe resistor is to the right of the heater blower moter
They generally locate the heater motor speed resistor nearby the blower motor because the resistor depends on the blower to keep it cooled.
The heater resistor on a 94 Astro is located on the top of the heater box under the hood, it has a four or five wire plug on it and two 6mm screws hold it in a hole in the heater blower box.
There are heater-resistance wires in the glass of the back windshield.