raymr - thanks for the info. Pardon my ignorance, but do I need to pull the radio to get to these valves? What do they look like? Can I get to them through the glove box? Or does the whole dash need to get pulled.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280