Keep your Peterbilt Model 579 with MX13 485hp engine running cool and comfortable with this complete ATPT AC system kit. This comprehensive package includes all essential components for a full AC system upgrade or replacement: a new AC compressor, expansion valve, and AC dryer. The compressor is engineered to deliver reliable, consistent cooling performance under demanding conditions, while the matched expansion valve ensures optimal refrigerant flow control. The included AC dryer helps remove moisture and contaminants from the system, protecting your investment and maintaining peak efficiency. This kit is specifically designed for seamless compatibility with your Peterbilt 579, making installation straightforward while ensuring proper fit and function. Perfect for fleet maintenance professionals or repair shops looking for a complete AC system solution.