Your Pontiac Vibe is making a clicking noise behind the glove box When you turn on AC it stops?

The clicking noise behind the glove box in your Pontiac Vibe is likely due to a malfunctioning actuator or a foreign object obstructing the blend door or recirculation door. When you turn on the AC, the change in airflow may temporarily alleviate the noise as the system adjusts. It's advisable to inspect the area for any debris or to have a technician check the actuators for proper function. Ignoring the issue could lead to further damage to the HVAC system.