This article analyzes the corrosion processes occurring in the cooling systems of automotive lighting fixtures and their impact on the technical condition. The causes of corrosion in cooling system components, the physicochemical properties of materials, and the influence of environmental factors are studied. The research also considers methods for reducing corrosion and extending the system's service life, such as using modern protective coatings, employing corrosion-resistant materials, and selecting the optimal composition for coolants.