I have owned this Diesel auto Santa Fe for 6 years and have taken the mileage from 32k to 72k. During all this time I have had an intermittent fault , that I can only describe as a whurring sound at about 1800 rpm and disappears at 2000 rpm
Its not dependent on the weather or temperature or if the fuel tank is full or not
It will do this through the gears ,but not in top. It will do this for days on end ,then stop and not do it for some time. I only use BP or shell fuel and never use supermarket fuel. I have had it on a fault diagnostic a few times and it shows no faults. Also all the fluids have been changed at times and it makes no difference
Any thoughts on this please would be welcome

 

Is it an automatic transmission?

 

Yes it is automatic. but still does it when changing gear manualy

 

Just found out that it only makes this noise when the Air con is off.
Keep the air con on and it never does it 1
Any Idears

 

Could it be the AC pulley is making the noise?