I have removed the under bonnet sound deadening on mine (and kept it so that it can be put back to standard if required at a later date), but it is a supercharged engine so I expect that it can create a bit more heat than a standard 260. Some have put bonnet vents in the bonnet to aid cooling, but that is a bit of an undertaking.Originally Posted by Trower36
If I were you, I would check when your coolant was last changed and if it was over 2 years ago then I would change it along with the radiator cap. Also if your radiator has not been changed, it might be worth checking that too. When I checked my radiator (factory fitted original), the bottom of it was bowed downwards. I did not want to risk it blowing when out on the road, so it got changed.
After changing the radiator and coolant, the under bonnet temperatures ran significantly cooler. Not scientifically temperature tested, but my face was able to stand the under bonnet temperatures more easily when I opened the bonnet after the rad and coolant change
PS If you do remove the under bonnet sound deadening, then sealing the windscreen washer jets becomes even more important as there will be no sound deadening to absorb any water ingress through the washer jets. It's a very straightforward job.
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