As with the earlier Laguna I the climate control does make a noticable differance to the acceleration of the car with the smaller petrol engines.
For example if I accelerate and then pop the cc on you can notice a dip in performance straight away. However the K+N helped to smooth this out a little more.
I also report that the additional noise needs to be looked at.
Maybe drive belt related me finks - so would wear gloves and coat and not use the cc until you get it looked at because a broken belt could cost you mucho more damage + dosh me finks..