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Originally Posted by mellowboy
Maybe theres some moisture trapped inside.
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Solaris, unplug that drain hole in the bottom. Its not a drain hole, its a vent.
Many Ford headlights have a vent top and bottom. The heat from the headlight causes air to warm up. Warm air rises and it will emerge from the top vent. (This top vent should have a tiny rubber hose on it, turned downwards. )
Cooler air is gradually sucked in the hole in the bottom, so the air circulates and any stray moisture is removed.
Lots of Fords are like this, lots of GM and other cars seem to have sealed headlights with no vents at all.