Wide applicability and modular design: specially developed connection components with a modular build enable flexible positioning and precise leak localization during maintenance of cooling and climate control systems across different types. Reliable system diagnostics: combines micro-leak detection with adjustable sensitivity and systematic pressure evaluation to provide consistent performance analysis for air conditioning service. Versatile vehicle use: reusable repair kit for cars, vans, and commercial vehicles from common manufacturers; automatic adjustment to pipe diameters from 6 to 16 mm. Structured troubleshooting: self-explanatory operation with visual step-by-step guidance reduces complexity and offers a time-efficient solution for both beginners and experienced technicians with immediately actionable repair steps. Use scenarios: - Service a sedan or small van to locate a small leak in HVAC lines (6-16 mm) using modular connectors and micro-leak detection, followed by a pressure check to confirm repair. - Maintain a mixed fleet of commercial vehicles; quickly diagnose recurring leaks with adjustable sensitivity and standardized pressure evaluation for consistent results. - Training environment for technicians; guided, visual instructions enable new users to perform leak tracing and basic repairs with the kit.