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If you hear a clicking sound in your Ford Ranger coming from underneath the dashboard, it might be a problem with the blend door actuator failing. This actuator is a small electric motor that has sensors linked to your truck's climate control system. When you change the temperature or airflow settings, the signals pass through the actuator. A common issue is that the actuator can malfunction if the plastic gears are fragile and break. Another indication of a failing actuator is when your truck's heater blows cold air or the AC blows hot air.
The clicking sound coming from under the dashboard of your Ford Ranger may indicate that the blend door actuator is starting to malfunction.