I"ve never found anyway to dry them out that lasts. I've taken the
glass kind of cooked them in my oven till all the moisture evaporated
and then let them cool and immediately sealed them and the moister
still managed to come back.
Remove the rear cap and bulb without touching the bulb!
Use a hairdryer on a low setting to blow warm into the headlamp enclosure
until the condensation all evaporates.
I had to do this recently and the problem has not re-occurred, I don't know
how the water got in there in the first place though as the seals all seemed
to be intact.
Once noticed I had about 1/4 in of water in the headlamp in my 626. I
drilled a small hole with a ceramic bit to let out any infiltrating water.
I kept the car 6-7 years after that. The 9004 bulb was burning every second
year because of either the hole I drilled, either because of the water
infiltration. Was still a cheap repair, considering 9004 are only $8.
Thanks for the suggestions. I removed the headlamp and the parking light
bulbs, rigged my shop vac for blow and stuck the hose up to one of the
openings. That did the trick. Also, I noticed when I removed the parking
bulb that one of the three tabs that hold it place was missing. Maybe this
is where the water was getting in. At any rate I coated the rubber gaskets
on this lamp and the shell that covers the headlamp base with plumber's
silicon grease. This stuff is very thick and heat resistant.
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