I suspect that the (2) 3/2 valves on my 82 240D may be leaking. How fast should these bleed down and what is the characteristics of leaking valves and how do they control shifting ?

(edit: For the HVAC) They shouldn't really leak at all. If you can find a similar-vintage car at the scrapper's, just grab the whole row of valves, easy if someone's already pulled the stereo and/or CC unit--which is likely. Find the good valves from each set and make one good set.

I'm not sure what you mean by "control shifting." Of the transmission, or the HVAC flaps? If it's the transmission, the only "control" the CC has is to make it shift too hard with too many system leaks.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

It's part of the egr system, many have simply bypassed it.

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83 SD

84 CD