The day after I took delivery of the car the belt and the tensioner were replaced. The day I took delivery I really put the car through its paces. After I arrived home, parked and was at idle I heard a different belt/fan noise. So took back the next day. The replaced the front fan, rear fan, belt and tensioner all at once. Noise disappeared.

Until 1 week ago, everything was fine, then this noise.

Am I right in assuming the idle adjuster is the same as the DISA valve?