A Jeep Grand Cherokee 1998 had a broken headlight. I replaced the bulb, and noticed that the glass had shattered. The new bulb broke soon, also shattered. Any idea what's going on?
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What happened is there was a small amount of water in the casing of the headlight, due to a sealing breaking loose. I drained the water, sealed the crack, and the headlight has been working fine ever since.
New bulbs sometimes don't last long if they have any oil or dirt on them to begin with before you install them. Sometimes you can't even see the dirt or the oil but it's enough to cause the glass to overheat once your headlights warm up. Also, it should go without saying ( and surely you already know this? ) that you can't touch the new bulb with installing it or the oil from your fingers will overheat it to.
You might also have moisture or dirt in your headlight assembly that's causing this. Make sure everything is good and clean in there and that your headlight assembly is seated securely and isn't moving around while you drive.