There are some rather random pieces of rubber trim under the bonnet of my Roadster. I've only recently looked in any detail, they are so bad I'm assuming a previous owner did a bodge and that it wasn't factory original ?
They were arranged around the edge of what I believe is the "heater box" (as it is ahead of the heater matrix). I'm currently driving without them, and so far nothing has blown-up.....Are they supposed to channel air inwards from the louvres, or keep it out, or what ? Are they supposed to be smoothly-tapered to contact the underside of the bonnet ?
Yes whatever the material used they are designed to channel cool air from the louvres above into the heater matrix, avoiding the warmer air flowing from engine which would otherwise make for an over warm cockpit in hot weather.
Although the louvres face backwards I believe there is a higher pressure area benefiting the rear ones as airflow bounces back off the windscreen.
