Hello all,

I have been rsearching the proper technique to do a coolant change on my 87 300d, but I can't find the answer to one question I have...I have tried looking a lot!

The FSM calls for a forcibly opened thermostat when flushing out the system. Infor I have read, such as (Pelican Technical Article - Mercedes-Benz W124 - Coolant Flush and Replacement) state to just remove the thermostat when flushing, but this info doesn't say if it will work for the 300d...

So...should I just remove the thermostat when flushing out the system? Or is there some sort of trick/step that I need to know about.

Thank you and sorry for such a basic question!