Otherwise, the unit will eventually crack and break down. Most headlight housings have vents at the bottom and top to manage the difference in pressure. This is why you may see fog in your headlights first thing in the morning after parking your car overnight. If the outer lens cools down faster than the air inside the headlight unit, condensation can form. They need proper ventilation to prevent condensation from gathering within the unit, especially when the vehicle isn’t in use. Not only can the moisture diminish the light your headlights provide, but it can also corrode your assembly over time. So, why have your headlights started fogging up? And what can you do about it? What causes car headlights to fill with water? Many drivers have experienced the frustration of seeing their vehicle’s headlights fog with condensation.
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