Ok Steve thanks. By the way... the info you gave me about the location of the connector for the vacume pump was accurate. It was under the carpet between right front and rear seats. It was a crimp connector under the rug, and subfloor, inside the wiring chanel and then inside the wiring harness. I had to remove the front seat and cut the harness open to find it. There were about 5 wires crimped together(r/w)... the exposed tips all corroded to green powder. Grounds and switched grounds were also in poor shape.
Regarding the EHA valve... do you know if they are designed to leak like a failed water pump will do when it fails?
1993 190E 2.3
2000 Toyota 4x4 Tundra