have a 300 1991 with cooling problems. The temp goes above 100. The electric fans does not turn on. I set the electric fans direct, at low rpms the temp is normal but at high rpm the temp gets above 100. I already replace the cooling fan blade, pump sensor and electric fan sensor on top of engine.
I check the relays behind the fuse box for additional fuses but there isn't any.
I use to have another mercedes with similar problems and have it donated.