Radiator Repair Sims Radiator Service offers all services for radiators. A.. Clean and repair. The radiator is cleaned externally and internally by immersion. It is then inspected and repaired as needed. B. Rod-out and repair. One tank is removed and a rod is inserted into each tube to remove debris. The radiator is reassembled and tested. C. Recore. This technique uses existing tanks with a new core. D. Plastic radiator tank and gasket replacements. The radiator is placed in a special fixture to detach the damaged tank and/or gasket. The tank and/or gasket is replaced with a readily available new or restored part.