Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam

The correct answer identifies the sunload sensor as not being an NTC (Negative Temperature Coefficient) thermistor. NTC thermistors are temperature-sensitive resistors that decrease in resistance as temperature rises, making them commonly used in applications where temperature measurement or control is critical, such as in the in-vehicle sensor, ambient sensor, and engine coolant temperature sensor. The sunload sensor, however, operates differently. It typically uses a photodetector or other technology to measure sunlight intensity rather than relying on temperature changes to vary resistance. Its role is to detect the amount of solar radiation hitting the vehicle and adjust the air conditioning system accordingly to maintain comfort levels within the cabin. Thus, it does not fit the typical function of an NTC thermistor, making it the correct choice in this context.