Mine are cracked too and not from rocks hitting them. I have seen many complaints on the 07-09's about this. I think the bulb is very hot and the plastic can not handle the heat. Have it raining and cold water hot plastic do not mix. I think it will crack again unless replaced with a better material.
That was my thought as well. I have seen different housings, including the bulb, on the internet from $38 - $75. This is much lower than the price from my local dealership ($93). I just didn't know if anyone had better luck with a third party replacement.
Was planning on replacing fog light with the sylvania silverstar product, but if the lens is the problem, that might just make matters worse.
I didn't see any replacements with glass lenses. I would assume replacing it would only buy you a short time before it cracks again. My cracks are 1/2" and don't seem to effect the light output. I will just leave mine for now.
I have a 2008 Expedition EL 4x4. Both of my driving lamps have cracked housings, with one holding water. The oem parts are close to $100 a piece. Has anyone found a better alternative?
Also, I replaced the headlights with H13ST Silverstar High Performance Lights. The lights are brighter and a whiter light. I think they look better and perform better.
Thanks for your input.
If your lights are about the same size as the 2000 Navigator you should look at Northern Tool's web site. They have an excellent driving light with 100w bulbs for about $10.00 each. I put a pair on my Ranger and they really reach out there. I'm going to see if they will fit my Navigator soon.