Question about 2005 Lexus RX330

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Condensation in my headlight

Condensation builds up in my headlights and I have opened it up and sealed it all around with silicone but still no difference. I am wondering about how to first get rid of the condensation that has built up in the light itself. Then any proper way of sealing to ensure this doesn't happen again. Thanks guys.

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Okay if you have condensation in them now take out your headlight housing and your bulbs. Let them sit in the sunlight until the condensation has evaporated and use a glass cleaner to clean up any spots. Then get some clear RTV from an auto parts store or Wal-Mart maybe 2 or 3 tubes and seal all the around the headlight housing. If you have projection style headlight the rubber boot on the back can let in moisture if not properly sealed. Make sure this has a tight fit and if you notice a hole use some of the RTV around it. Repeat this procedure with the other side. I hope you have good luck with your project!

Posted on May 20, 2009

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You might wonder why headlamps are not designed to be 100% air tight, so that no humidity enters? Well, that would be in an ideal world with no heat losses in bulbs. As the headlights goes through continous warm-cold-warm-cold cycles as you turn light on and off, the air and plastic will expand and retract. This creates pressure changes, which will move a slight amount of air in and out. So instead of forcing the air to be inside, air is moved through controllable passages, so that minimum of road dirt will enter.

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  • 9 months ago
Seem to be seal is wear off
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The way to open that
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