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Back inside the car, the Gen-IV's case drain needs attention, as well as the actual routing of the dash vent hose, before we can charge the system. For the case drain, the instructions call for drilling a hole in the firewall one inch below the drain outlet on the case. Since the car had factory air, we opted to reuse the original drain hole. Taking the remnants of the original drain hose, we passed the Vintage Air drain hose through it, trimmed it to length, and installed its 90-degree end fitting for a clean and simple solution.