Rotate the temp dial back and forth a tiny bit when it acts up -- the 300TE has a tendency to stick on hot or cold, and I have to wriggle the dial to get a decent temp. I've heard this is loose pins on the circuit board, but I've not dived in yet to fix or find another one.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!