Chevy/GMC Pick-Up Gen IV is Vintage Air's most powerful and intelligent climate control system. The Gen IV uses an exclusive fully electronic microprocessor control system to eliminate cables or vacuum connections. Separate high capacity copper parallel-flow heat coil and aluminum plate and fin cooling coils provide outstanding performance and instant temperature adjustments. This new Chevy/GMC Pick-Up Sure Fit system includes our exclusive Electronic Cable Converters which convert existing factory controls to electronic operation. Additional features include variable blower speed and dash/floor/defrost blend. Sure Fit Systems are engineered specifically for each vehicle application and require absolutely minimal alteration to the vehicle for installation. 67-72 Chevy and GMC Pickup and Suburban; 69-72 Blazer and Jimmy 134a Complete 134a Vintage Air Kit. Instructions for how to install Vintage Air air-conditioning System can be found on our Technical Tips page. VINTAGE AIR A/C KIT