While minor condensation is normal and should clear as the headlight heats up, persistent fog indicates a problem.

• Fog lingers even after extended headlight use
• Moisture reappears frequently without obvious cause
• This often points to a clogged or damaged vent

Without proper air circulation, moisture cannot escape, leading to ongoing condensation.

Vents release excess heat generated by the bulb. Restricted air flow causes overheating issues.

• Headlight housing feels excessively hot during use
• Bulbs burn out more frequently than normal
• Blocked or broken vent prevents heat from escaping

This raises internal temperature, stressing both bulb and housing components.

Locate the vent (typically on the back of the headlight assembly or near the bumper).

• Check for visible debris: dirt, leaves, or dust buildup
• Inspect rubber tubes or covers for cracks, tears, or disconnections
• Damaged components fail to protect against blockages

A damaged vent cover disrupts proper air flow regulation.

Perform a simple test to check vent functionality.

• Gently blow air through the vent opening
• Use a bulb syringe or low-pressure compressed air
• Significant resistance indicates a clog
• Too easy airflow suggests damaged internal components

Gaps around the vent structure also indicate seal problems.

While minor moisture is normal, standing water signals serious issues.

• Pooling water at the bottom of the headlight assembly
• Damaged vent cannot prevent water entry or trap moisture
• Standing water damages electrical components over time

This is a red flag requiring immediate attention.