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General Motors was the first OEM to install Mircroheat's HotShot heated windshield wiper fluid system into its cars. That was in 2006. But the hot, wet good times didn't last long, with underhood fires causing GM to recall almost a million vehicles in 2008 due to problems it claimed were caused by the HotShot. For its part, HotShot didn't accept the blame, claiming GM's electrical system was at fault.