Coolant Leak

[S.Scogin]

I have a coolant leak coming from the block on my 240D. I checked to make sure it wasn't coming down from the T-stat housing, but it seems to be coming from where the t-stat sort of mounts to the block - and where the fan mounts to the block as well. Is there a gasket there? I'm going to replace my thermostat in the near future, but it seems to be operating correctly since the car warms up and stays at the proper operating temperature.