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The old favourite!

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Right, is it worth buying a new rear lense or will it mist up like the one i have know??? I have tried silicone sealer all over the show and its doing my head in. Will it mist up again if it does will it be changed? should i stick my car in the garage untill summer- every time i see the car looking great look at the back - minging!!! Comments please
 
I thought the newer lens assemblies had perforations to stop this along the top edge, mine dosen't mist up.

Kevin
 
The vents along the top of the newer style lights don't actually vent to the interior of the light unit, which is (reasonably) sealed. They actually allow air behind the units to circulate and escape. It seems to key to stopping the condensation is to...

a. Keep a positive air pressure inside the 'sealed' light units (hence the tubes connecting with the blower housing)

b. Allow hot air from behind the light units to escape, keeping the temperature of the air inside the light units down (hence the vents along the top)

The problem was caused by the air inside the units getting very hot, expanding and forcing its way out of any flaws under the pressure. Then, when the units cooled, air (which will probably be damp in the UK!) gets pushed back inside.
 
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