76 Carrera 3.0 offered new cabin heating control
 

In other respects, the Carrera 3.0 had the same features as the I and J series 911 and 911S, including a fully galvanised bodyshell and large ���elephant ear��� door mirrors. In 1976, for the J series, the Carrera 3.0 was fitted as standard with a new automatic heating system (this was also found on the Turbo and an option on other models. A problem with the 911���s air-cooled engine was that it was hard to maintain a constant cabin temperature. As the engine temperature rose in traffic, so did the interior, which meant you were constantly tweaking the temperature levers between the seats. The new system replaced the levers with a control knob that you turned to set the required cabin temperature, as measured by a sensor between the sun visors. A servo motor between the seats opened and closed the heat-exchanger valves as required. It wasn���t perfect, but certainly a move in the right direction, as buyers became less tolerant of the 911���s foibles.