Jenson Button’s Monaco Grand Prix came to an abrupt end on his second lap due to a blocked radiator air intake on his car’s left sidepod. The offending item has a small hole in the middle and is normally used in conjunction with a blower to help cool the car when stationary either in pit lane or when forming up on the starting grid. However the hole is not large enough to allow the car to operate at optimum condition at full race pace and this caused Button’s engine to overheat and fail.
Thanks to some sharp work by Ross Harper you can see an image of Jenson’s car showing the blocked sidepod by following this link to Flickr.