Clay Cooley Hyundai is located in Rockwall, TX. Our service center is staffed with expert technicians who provide quality Hyundai repair and maintenance. The Clay Cooley Hyundai’s factory certified technicians are trained to ensure your Hyundai runs well for the road ahead. Call or email us to set up an appointment today. Clay Cooley Hyundai is located in Rockwall, TX. Our service center is staffed with expert technicians who provide quality Hyundai repair and maintenance. The Clay Cooley Hyundai’s factory certified technicians are trained to ensure your Hyundai runs well for the road ahead. Call or email us to set up an appointment today.