-The blower motor in Figure has blower motor speed M2,M3,and High speed.But does not run in either LOW or M1.Which of the faults listed below could be the cause:
A) Faulty blower motor.
B) Faulty blower motor relay.
C) Faulty Heater A/C control assembly.
D) Faulty resistor block.

Question

-The blower motor in Figure  has blower motor speed M2,M3,and High speed.But does not run in either LOW or M1.Which of the faults listed below could be the cause:
A) Faulty blower motor. 
B) Faulty blower motor relay. 
C) Faulty Heater A/C control assembly. 
D) Faulty resistor block.

Quizplus · Accepted Answer

The blower motor working on higher speeds but not on LOW or M1 indicates that the motor itself and the relay are likely functioning correctly, as these components are used across all speeds. The issue is more likely related to the resistor block, which is responsible for reducing voltage to the motor to achieve lower speeds. If the resistor block is faulty, it could prevent the motor from operating at lower speeds while still allowing it to work at higher speeds where the resistor block is bypassed.

-The Blower Motor in Figure Has Blower Motor Speed