Well here is my problem i was wondering if you can point me out in the right direction.
I have a 1991 MB 300 Turbo Diesel i realized that the back seat head rest will not go down when i press the button and the AC blows only through the defroster not the front fins. So i started looking at the vacuum lines trying to see where are they leaking but they all seem fine (no cracks) other than some loose fittings but when i blocked those than i saw that if you suck the air out of the lines it seems like there is air still comeing from Intake Manifold Pressure Control Valve Transducer, the Orifice or Vacum Damper i cant really tell and the green line that i guess goes to the front AC fins that is also conected at the same spliter as the lines for the head rests (i have not been using some sort of vacuum device just through my lungs). Now if i connect the lines straight from the vacum pump to the headrest it will lower them but not imediatley, very late, delayed in other words like you have to keep the button pressed for 30 seconds or so to happen. I also go and try to feel how much vacuum does the pump creates and is really weak in my opinion. So i was wondering a good working vacum pump how much vacum does it create?? is it noticable like will it hold the finger or toungue if you place it at the pump outlet directly or is it barely noticable but it builds up if there is no leak and than all those above components are foulty.
Any help will be appreciated it.
Thank you very much
Denis