camshaft dephaser pulley
valve variator
it sounds like your wheel bearing if its a whaling noise
could be a wheel bearing...or just that its a french car
Put dry gas in and if that does not help give it a tune up, check for bad coils and ensure motor mounts are good.
cos its a renault
Sounds like a bad relay
it is not the hazard system, but comes from the speedo cable which is routed behind the dashboard thus making it sound like the flasher unit.
more detail required, what are you doing to cause this and where does the noise/ smell come from?
it depends
A clanking noise in the rear of a Renault Scenic could mean the rear wheel bearings need to be replaced or greased. A clanking noise in the rear of any vehicle can be a problem with the rear end gears, the drive shaft, or even a lug nut that came loose and is clanking around inside the hubcap.
tires
The pitch of the propeller causes this noise.