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RESISTOR
12 speed, you mean 1 or 2 speed? Anyway, when a fan speed control only works on high it almost always means the Resistor Pack is defective and needs replacing. It can be the speed control itself but it is highly unlikely. 99% of the time it is the Resistor Pack.
where is the heater control valve on a 1994 2500 suburban
It is a resistor or a group of resisters used to control the flow or current in a circuit. Like the resistor block in a car controls the speed of the a/c blower.
A: it does not control electricity but Rather varies the potential subjected to.
Volume Control Light Control Speed/Frequency Control Temperature Control
It's in the resistor block, which in the diagrams comes right after the fan control switch
Variable resistors means that a resistor which can change its resistance by control by any person or it self and fixed resistor means that it can not change its value.
Electronic Control Unit or Computer.
the first part I would look at replacing is the fan resistor this may be a circuit board or a assembly of three coils which regulate the fan speed. This resistor may be under the dash where your blower is located or under the hood next to your blower. Hope this helps you.
Same as any other kind of resistor, they're used to control voltages and currents in electric circuits.
you take it out.