 The CNC Auto Show is brought to you in part by Dorman Products, featuring the largest selection of direct replacements for failure-prone turbocharger system parts in the business. Learn more at DormanProducts.com. Coolant leaks can be tricky, as the cause may be any number of problems. Case Hill is a one-step, permanent, multi-purpose system for coolant leak repair. We recently sat down with Mike Schluck, Managing Director of Case Hill International.