I have a 1989 760 turbo with 195,000 miles. Automatic transmission.
Overdrive functioning has been sporadic at best, functioning most reliably when outside temperature is in the 80s (F) or so. I've replaced both the solenoid and the relay (with new parts), with no change in overdrive behavior. Now that the weather is turning cool, it doesn't work at all -- even after a long drive.
What's the next thing to check?
Thanks,
--Dale