It is done!
Whew, I am very glad to have finished the job. Heater cores .....!
Everything works but a long process spanning several weekends (not continuous work) and multiple evenings.
Besides the heater core I upgraded the radio which required some rewiring to bypass the central fader switch and changed the console. I checked all the bulbs in the instrument cluster and of course the climate controls. The vacuum controllers all got changed.
It took several used push button units to find a good used one.
Would I recommend this to someone ..... hmmmm .... I would say yes, but .... Be sure to have a lot of time, patience and be a student of the subject. Really come to understand exactly what is required to pull the dash.
Additionally, all the suggestions from the forum members made a real difference. I remember one member who had done this and said to be sure and install the little square nuts into the new heater core before installing in the heating/ventillation central unit. Easy thing to miss or forget and a total nightmare when one discovers you can't secure the coolant tubes.
Its late, I'll post pictues later.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)