classictrimcoat.com will be coming out with a video on the heating and air on the e23 series soon. It will include: how to remove the console without damage, how the system works, where vacuum servos are located, how to replace them(and sometimes repair them), location and function of the control unit and much more. future videos will be on: 1.Changing the master cylinder 2.Changing the acumulator or (bomb) 3.Changing the power steering unit