This really sounds like a usefull mod to do on my car. As soon as it is delivered I will start working on it. Since it is getting cold around here, this is the time to do it. Cause if I understood right the setup is the same for my w123 300 TD (OM617) non turbo. Only have to find myself a thermo-switch. And if I won't find one I will be able to add that, since I did the same on an other car of mine..

Still one question left. Is 50 degr. (celcius) not a little hot to trigger the GP off?? Is the coolant heated over 50 deg. within 1 minute before the relay shuts itself off??