Radiator cooling fans do not run/start
I have a 155 2,5 TD, and when weather turned warm and nice the other day I noticed that the radiator cooling fans do not run - overheating in queues.
I have two fans and one thermostat for each of them.
When I take off the cables and connect them nothing happens, but if I connect the live,
blue/white cable to earth, the fans start.
I have the repair manual on CD but the wiring diagram and faultfinding scheme are both unreadable.
I take it the principal layout of the radiator cooling fans is the same on all 155s, although the relays, fuses etc are in different places.
Could someone please help?