After reading the board messages here for the last few months, I have begun repairing the hvac system. ['85 735 ] So far, I have located five different leaks. Still have some to go , and therein lies my questions. 1. How do I replace the 2 way vacumn actuator located in the dash, behind and to the right of the radio? It seems to be riveted to a control arm that disappears into the bowels of the dash. [ the hose colors are orange and yellow and the accuator controls the air flowing to the front center grill and defrost vents ] 2. How do I access the accuator that is controlled by the dark blue hose coming from the vacumn distribution center located behind the ashtray? Where is it located? 3. Does any one have a diagram of the location of all accuators and their purpose? Thanx to everyone for your previous posts - they have helped a ton!