Last year's W10 had cooling issues that the team could not fully address during the season because of limitation on radiator capacity.

The weakness was especially apparent in the Austrian GP, when extremely hot weather compromised the overall performance of the car.

"We've improved the cooling package," said technical director James Allison. "We've created more face area – so more actual radiator area in the car – which is a difficult thing to do mid-season without incurring quite a lot of penalty.

"But between the years you can do it and it won't cost you except a little bit of weight.

"We've also benefitted from an investment that HPP have made on our behalf. They've worked to raise the operating temperature of the engine which eases the cooling burden on us because the hotter the fl

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