The bolt I'm talking about is #293.

It definitely is strange how that loose bolt allowed a coolant leak.

Maybe it just allowed one of the pipes to torque itself loose enough to spring a small leak.

I will keep an eye on it.

I was actually worried that a head gasket leak appeared near there and the coolant just managed to find it's way out at the loose bolt.

Thanks for the diagram.

__________________
1993 W124 300D
-297K on the clock as I type this.