E91 - 318d - N47T - Metalic Shearing / Noise Coming From Engine Bay
This started happening of late. New noise coming from the engine bay.
I’ve been bringing the car to a local BMW Technician, and generally been quite happy with the work; but would like second opinions on the source of the sound.
About the sound.
It seems to dampen/lessen when accelerating, and when put into gear.
Initially I noticed a bit of a leak coming from the rad and used radweld additive to see if it would help seal the leak and stop the sound. I thought a small crack in the rad could create pressure and hot escaping gasses could produce the whistling like sound.
After letting the engine run, I did notice the sound seemed to dampen and I’m pretty sure the leak is now fixed. Am keeping an eye on this.
Took the car for a long drive (two+ hours both ways)
and noticed the noise appeared to have vanished.
The sound has came back but I don’t see signs of radiator fluid.
Seems like the noise could be coming from the belt / engine block.
Worth highlighting, it seemed like the rad leak was spraying onto the block. So, maybe the rad fluid stripped something away causing the noise.