Help!!! The electric fan is dead on my 88 300E

I do not know anything about Mercedes
Could someone explain to me how the electric fan in front of A/C condenser is wired and where the connectors, switches and relay are? I would like to jump the fan motor to see if the motor is dead or the relay or a switch are bad... The fan does not kick in even with A/C on and temp gauge all the way to the last white mark...

Is there a way to bypass the A/C high switch (if it operating the fan) and have it hooked up so it kicks in when the engine is warm regardless of A/C on or off? If the motor is bad, is there way to wire in a cheap fan from Pep Boys? I can use all help I can get so please feel free to comment or advise... Peter