Hey, you sound like you understand these things. I know that he tuve is called a capillary tube. It somehow maintains the temperature of the sir inside the passenger compartment at a certain level. I have never understood how. But what you are saying about the "piston" really intrigues me. My car (78 Z) has always been kind of cold and I have oft wondered if itis adjustable. There is a little scrw which sticks out of the water **** that you can turn with a small screwdriver. If there is a piston which limits the opening of the valve, then does this screw act as an adjusting screw by defining the most open position of the piston somehow? If that is the case, then is it possible to open it up and make the car warmer by turning that screw? I would assume that turning it counter-clockwise (loosening) would make the car warmer... This is important. Any comments??
