Automotive Service Excellence (ASE) Air Conditioner Certification 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer indicates that an open in circuit 95S between the 95/95S splice and the high-speed relay could be the cause of the cooling fan's failure to operate at high speed. This situation suggests that there is a disruption in the electrical pathway required to activate the high-speed fan function.

When the cooling fan operates at low speed, it indicates that the fan control resistor is functioning correctly, allowing lower voltage to power the fan. However, for high-speed operation, the current needs to flow through the high-speed relay. If there is an open circuit between the splice and the relay, the signal that should activate the fan for high-speed operation cannot be completed. This results in the fan being unable to switch to high speed, while still functioning normally at a lower speed.

The other options would not lead to the exact symptom of the cooling fan only operating at low speed. A faulty fan control resistor would likely affect both speeds, and a blown fuse would prevent any operation altogether. Similarly, a short to ground in the circuit would commonly cause the fan to act erratically or not at all, rather than only failing to engage at high speed. Thus, option B correctly identifies the issue of limited functionality in the fan's speed due