Experience The Difference At Coulter Tempe. Tempe Autoplex - i-10 and Elliot Road. Proud to be part of the Coulter Automotive Group - serving Phoenix since 1923. Onyx Black 2024 GMC Sierra 2500HD Denali 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel 10-Speed Automatic, 4WD, Jet Black Leather. Recent Arrival!