I have noticed that the shifts on my 85 300D are kind of harsh when engine and transmission are cold. I have recently changed fluid and filter and adjusted the Bowden cable. Shifts when warm seem fine.

Maybe the 50C switchover valve isn't operating? I guess I need to come up with a method of testing!


In this thread, Dennislarock said:
"At a coolant temperature below 50º C, a temperature switch (#20) cuts off vacuum signal from the VCV at a Switchover Valve (#125) on the diagram. The vacuum in the circuit produces a higher vacuum to the transducer from a direct line to the vacuum pump (#76) (Should be 67?). Then this higher vacuum is sent to the modulator softening the shifts while the engine is cold.
When the coolant temperature rises above 50º C, the switchover valve is powered on and the VCV controls the transducer."

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5