Hi gang as in the title I am having some issues with the heating system in our 420 SEL.
First it is putting out heat, but it will not blow hot as you travel down the road.
When you stop and shop then get back in the car it will blow hot for a short time then cool off.

I am thinking in terms of a vacuum problem with the fresh air vent.
I took the center console apart and found two vacuum pods, one rectangular, one round, and they both react when you change heat settings on the temp wheel.
I need the diagrams to tell me where the other four lines that come off the regulator valve go.
I have four lines that go up toward the top of the dash, they must go back out to the under hood area.

Thanks for any help provided, JNT