My daughter has a 2013 Adam Glam. For a little while now there has been a strange rattling noise from the engine bay, like a pulley or something rotating, but not correctly. Today she had to stop the car as Error 04 came up on the dash and the temperature guage went off the scale. Error 04 in the manual says air con switched off, so I’m confused by that. I got the car home and put coolant in and topped it up to the max level (the expansion tank was nearly empty). On starting it up, the rattling noise is very noticeable and there is a steady water drip from underneath, can’t see where underneath due to the plastic tray, but rear edge of tray. When I look to the front drivers side of the engine, where the main belt is located, it looks like the pulley at the front (air con compressor I think) isn’t rotating, although the belt is going round. Any ideas what can be wrong ?