Ford Corsar Repair Manual page 182

E.C.C.S. DESCRIPTION
Radiator Cooling Fan Control
Vehicle speed sensor
Air conditioner switch (where fitted)
Air conditioner request
Vehicle speed
+
Water temperature sensor
Radiator Cooling Fan Operation
The E.C.M. controls cooling fan operation from information received
from vehicle speed sensor, water temperature sensor and air
conditioner switch (where fitted). The fans are operated via cooling
fan relays (high and low) at either low speed, high speed or off
according to the conditions as shown below.
Engine temperature
+
E.C.M.
Radiator cooling fans
High speed
Where air conditioning is not fitted, fans will operate as for air
conditioner OFF.
Note: To enable high speed fan operation, both relays must be
energized.