Air-Conditioning Fault Found During a Used Car Inspection

During a recent pre-purchase inspection, an active fault was detected within the vehicle’s climate-control system during the electronic diagnostic scan.

The diagnostic information indicated a mechanical fault involving the left footwell flap servomotor.

Rather than relying on the fault code alone, further checks were carried out to determine whether there was an observable issue with the air-conditioning airflow controls.

Diagnostic Scan Finding

The electronic diagnostic scan recorded an active/static fault relating to the left footwell flap servomotor.

A fault code can provide an important indication of an issue within a vehicle system, but further physical checks can help determine whether the fault corresponds with an actual operating symptom.

Diagnostic scan showing left footwell flap servomotor fault during used car inspection

Further Air-Conditioning Checks

The vehicle’s climate-control settings were then adjusted so that airflow to the footwell area was deactivated.

This allowed us to check whether the air-distribution system responded correctly to the selected setting.

Footwell airflow deactivated during air-conditioning system testing

Physical Fault Confirmed

Despite the footwell airflow being deactivated, air could still be felt coming from the footwell vent.

This physical behaviour was consistent with an issue affecting the operation of the footwell air-distribution flap and supported the diagnostic finding recorded by the scanner.

Air continuing from footwell vent despite airflow setting being deactivated

Why Physical Verification Matters

Electronic diagnostic scanning is useful for identifying faults stored or currently present within a vehicle’s control systems. However, a fault code should not automatically be treated as a complete diagnosis.

Where possible, we further assess the relevant system to determine whether there is an observable symptom corresponding with the diagnostic information.

In this case, the combination of the active diagnostic fault and abnormal footwell airflow behaviour provided stronger evidence of an issue within the climate-control air-distribution system than either observation would have provided on its own.

Inspection Conclusion

The air-conditioning system was still capable of producing airflow, but an issue was identified with the control of airflow to the footwell area.

The finding was documented in the pre-purchase inspection report so that the customer could take the condition into consideration when assessing the vehicle. Learn more about the areas covered in our pre-purchase inspection checklist.