I put the new thermostat in place oriented exactly like the one I removed, and all is well once again. I saw no arrow on either thermostat, nor did I see that the orientation would matter anyway.

Now, the engine runs a little cooler than it did before the thermostat broke, but lots warmer than it did with the (obviously) broken thermostat in place.

I'm still curious about the reputed arrow. Might this consideration pertain only to older model year diesels? 240D's only?


Phil

'84 Euro 300D, warm again inside
'85 300D