Dumb me, let my ‘76 240D idle in the heat for a few minutes while I got out for a bit (auxiliary fan is not working). I noticed the car stopped running, and then I heard spewing and hissing. Within the next few seconds lots of coolant was on the pavement. Oddly enough I was at my mechanic‘s place, but he can’t look at it for a while. QUESTION, does the W115/OM616 have overheat protection via a temp switch that shuts the engine down? Or is it more likely that the engine shut down because it is damaged (damage beyond a belt or the radiator)?