My 2012 S60 started making a loud click noise on cold start and while the engine is cooling down (after the engine is off). The sound ressembles like something knocking on a piece of hard plastic. The car only has 87,000km. The noise appears to come from the top or back of the engine. In this video, you can hear the noise at 0:13, 0:17, 0:19, 0:25, 0:35 and 1:02 in the video. The noise isn't constant and reduces in frequency when the engine is warm. The dealer hasn't been able to pinpoint the source of the problem. Has anybody heard this before?

 

Hello! I know the thread is old, but did you ever get to the bottom of this? i have exactly the same issue with my 2016 XC70 T5 AWD. Thanks!