PeachParts Mercedes-Benz Forum - View Single Post - W126 Climate control theory

tinypanzer · #12 03-31-2010, 06:27 PM

One thing I forgot to mention in my last post is that the missing "resistor" on port two of the valve causes a couple of things. First, it makes the recirculator flaps work really fast, which is good. The second thing it does is make my theory about broken pods that much more correct. By this I mean that with that resistor removed, a leaky recirculator pod will rob the entire climate system of vacuum immediately if that port is open, whereas if the resistor was there, there may still be enough vacuum for the other components to operate albeit much more slowly. So when testing your pods be aware that there are two sets of behavior depending on if your port #2 has that little resistor or not. It may have very well been the case that if my valve module had that resistor there, my symptoms of front center vent air disappearing immediately upon switching on the recirc switch may have either happened much more slowly, or possibly not at all. So there is a trade-off if you pull that resistor out; your recirc pods work much quicker but if they ever leak, you will have much more dramatic symptoms due to the increased vacuum loss possible with a wide open port.