Compatible with 1981-1987 Chevrolet/GMC C/K Series Truck. Complete air conditioning, head, and defrost system. Fits trucks that came from the factory without A/C. These kits are constructed to mount to existing holes in your dash and firewall without fabrication. Kits include evaporator, compressor, drier, all mounting brackets, hardware, louvers, duct hose, pre-formed aluminum lines, hi/lo safety switch, wiring harness, new backlit 3 lever control panel and installation instructions.