Jerrold:
You will have to get a MitiVac to fix the vacuum, not really possible without it. Fairly easy to troubleshoot the climate control and door lock with -- the vacuum supply for the climate control is the green plastic line up by the brake booster, the lock supply line is yellow. If you can pump the vaccum down on either one and it holds with the Mitivac, the problem is supply. If you cannot get a solid vacuum with the MitiVac, you have leaks.
You may also have a major leak somewhere around the booster or other vacuum operated stuff -- if just found out last night that the EGR and air recirc swithover valves on my 87 300D were bad -- no center vents with the AC on. I have pugged the hoses pending replacement or repair of vacuum lines.
The water is from bad window gaskets or one of the other causes listed. If it is the window gaskets, get them replaced right away -- front and rear windows both have a large heavy rubber "seal" -- this is shrunk and lets water in at the top. The water then travels around the edge of the glass and out the bottom inside, and hence down below the package shelf and dashboard to the floor. You will have rain marks over the wheel wells in the trunk, too.
There are also four sunroof drains (the panel doesn't seal, there is a tray to catch the water) -- if these are plugged, water comes out from the top corners in front, soaking the floor.
There is also a foam tube connecting the AC water drain to the exterior -- dead center above the tranny under the radio. If this is gone (and if it hasn't been replaced, it is), any water that gets into the climate control and/or AC condensate will run out from under the console.
Finally, there are drains at the front corners, under the air intake grilles. These can be plugged, and if they are, water will spill over into the back of the dash area. They can also be rusted out
, requiring sheetmetal repairs.
Good luck!
Peter