Jeff Gordon, left, and Jimmie Johnson wave to the crowd during driver introductions for the NASCAR Sprint Cup series auto race at Richmond International Raceway in Richmond, Va., Saturday, Sept. 6, 2014. (AP Photo/Steve Helber)

CHARLOTTE, N.C. (AP) — Jimmie Johnson said the cooling system for his helmet was blowing warm air and that likely caused his dehydration following last week’s race at Richmond.

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