On a vehicle equipped with and automatic temperature control system the blower motor will not function when the vehicle is first started and heat is selected.Which of the following is the most likely cause?
A) The ambient air temperature is faulty.
B) The in-car temperature sensor is faulty.
C) The system is functiong normally.
D) The blower motor has higher than specified resistence.

Question

Quizplus · Accepted Answer

When the heat is first selected on a vehicle equipped with an automatic temperature control system, the blower motor will not operate until the engine coolant has reached a certain temperature. This is a normal function of the system and is not indicative of a fault. Therefore, option C is the correct answer.  The ambient air temperature sensor and in-car temperature sensor are unrelated to the blower motor function, and higher than specified resistance in the blower motor would cause it to operate poorly or not at all, not just during initial operation.

On a Vehicle Equipped with and Automatic Temperature Control System