The seal around headlight units may become loose, break down & leave gaps in any year & model of car or van. Modern cars have major moisture issues as modern LED headlamps do not generate much heat in comparison with older style halogen headlights for the moisture to dry out.
Note - Headlight resealing & condensation repair is suspended until further notice.
For now please try these simple steps,
Check the headlight air vents are not blocked by dust or leaves as the moisture needs to escape. A quick blow with a air compressor should unblock the air vents.
If your headlight has any back covers keep them off at all times so air can get in & moisture can get out. (Ventilation)
Inspect the outer headlight lens for cracks or small holes.
If your car is quite new be sure to contact it`s manufacturer. Check warranty
Stop using very high powered pressure washer directly on headlights at a close range which can cause water droplets inside of the headlights & even cause headlights to move out of place. Skippy recommends that headlights should never be high pressure washed.
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Headlight seals which surrounds the headlamp housing may have broken away or come apart or the air vents could be blocked.
Best way is to reseal the headlights to stop the moisture getting any worse.
Yes it can cause electric shorts & maybe blow a fuse or two.
Yes if it distorts the beam pattern of the light output.
A single drop of water can shatter a hot bulb. Condensation will cause corrosion of the terminals in the connector.
Maybe a design fault please ask your car dealership for further information.
Please check your headlight housing for any openings & holes. You may use a mini vacuum (on low power) to suck any insects out from the headlight.
Bad seals or blocked air vents, Headlights need to breathe and any moisture needs to escape through the vents.
Please do not drill directly into the headlight lens, If you must drill a few holes on the back headlight cover for further airflow.
Condensation in headlights is normal and should go away on it's own, think of it like a bathroom window when you go for a shower.