UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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There are two different causes for this here.First is a restricted or damaged vent.Almost all head lights have some kind of small vent hole that is used to allow some air into the head lights.This allows drying of any condensation and to prevent any condensation from building up.Inspect the light assembly for a vent hole or port that may be damaged or restricted needing repaired.If it cannot be repaired the head light assembly will need replaced.
The other issue is the glue or seal that holds the head light lense to the head light body leaks.It may not be a visible leak but it leaks enough to allow moisture or cold air through more then it can handle by venting and causes the condensation.On some models the lense comes off of the body of the head light and the seal can be re glued to correct this here and on other models the entire head light needs replaced.
In some cases when the fault is unable to be identified visually you may have to replace the entire head lamp assembly but I would check for the vent and also see if there is any way to re seal the lense to the head light body.
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