Blower motor system fan speed control is being discussed. Technician A says this is done by a resistor block wired in parallel to the fan. Technician B says this is done by use by a power module. Who is correct?

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. Fan speed control in blower motor systems can be achieved through a resistor block, which is typically wired in series (not parallel as stated, but the intent seems to imply control mechanism), to provide different speed options by varying resistance. Modern vehicles may use a power module (solid-state controls) to more precisely control fan speed.

Blower Motor System Fan Speed Control Is Being Discussed