Allan, Here is what I can tell you based on your points so far>
1) Yes, probably the pump 2) Thats the servo moving... a great sign! 3) Yes, something is very wrong for this to happen. I'd start by checking the fan motor to see if its seized, so you mentioned. Just apply 12V, or turn turning by hand first. If the fan works, start looking for vacuum leaks. The servo will move even if there is a vacuum leak, but the fan will not come on if the leak is bad enough. There are some vacuum actuated switches that needs to be tripped for the fan to work. Don't worry about the servo or amp if you really hear the servo moving... this is a great thing! Good luck Jaime On Fri, Nov 25, 2011 at 6:17 PM, Allan Streib <str...@cs.indiana.edu> wrote: > Next priority on the W116 is to get the ACC working, at least to the > point where I have working heat and defrost. I'm pretty sure the AC > compressor is siezed so I'm not worrying about that right now. > > Symptoms now (Air Cond switch OFF for all of this): > > 1) Faint noise of something running continuously in the under-hood servo > box. Sounds like circlulator pump but I verified it is coming from > the box, not the circulator motor right next to it. Runs whether key > is on or off; only stops if I pull the in-line fuse in the fusebox. > > 2) With key on, when I select one of the buttons (e.g. AUTO LO) I hear > what sounds like another motor in the vicinity of the servo box > (since I'm in the car hard to tell for sure). If I change the > pushbutton setting to "Off" it sounds like it reverses and then > stops. Also hear flaps moving under the dash. > > 3) Main ACC fuse (#3) blows within a few seconds if I select any of the > pushbuttons. Since I never hear the blower I am guessing siezed > blower motor. This does not affect any of the behaviors in (1) or > (2). > > Anyone have a good troubleshooting guide for this system? > > Allan > -- > 1983 300D > 1979 300SD > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
