Lewis Hamilton says Mercedes are unlikely to fix their cooling issues for the German Grand Prix, with the championship leader hoping rain can assist at Hockenheim for a second year in succession.
Hamilton won in Germany last year with a masterful drive in the wet to win from 14th after Sebastian Vettel crashed out of the lead.
With Europe gripped by a heatwave similar to the one that arrived around the Austrian GP, Mercedes are concerned that there could be a repeat of their disappointing performance at the Red Bull Ring, although a new cooling system has been put on the W10 for the weekend.