When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
the part "Inside" made me think it wasn`t external . . .
I read that too - but the normal misting is external and the OP's tone seemed unsure. Hope it is external - hence my suggestion as it's an easy fix. Otherwise it'll be opening up the headlight unit which is a pain.