Condenser Fan Operation
For MFIThe Condenser Fans Motors (M113, M121) on vehicles equipped with MFI-V8 engines operate when any of the following conditions occur:
1. Coolant temperature exceeds 100°C (212°F).
2. The air conditioning system is operating.
3. The Engine Control Module (ECM) (Z132) determines that fuel temperature exceeds 70°C and coolant temperature exceeds 110°C after engine shutdown. When this occurs, the tans are turned on for approximately 10 minutes after the engine is shut off.
For NAS SFI
The Condenser Fan Motors (M113, M121) on vehicles equipped with SFI-V8 engines operate when any of the following conditions occur:
1. The A/C system is operating.
2. The Engine Control Module (ECM) determines that Condenser Fan Motor operation is required.
With the Ignition Switch (X134) in position II, battery voltage is applied to the Ignition Load Relay (K127). The relay is energised, applying battery voltage to the Condenser Fan Relay (K109). When Condenser Fan operation is required, the Engine Control Module (ECM) (Z132) grounds terminal 85 of the Condenser Fan Relay (K109). The relay energises, applying battery voltage from fuse F3 of the Engine Compartment Fuse Box (P125) to the Condenser Fan Motors (M113, M121). When Condenser Fan operation is no longer required, the ECM removes the ground supply to the Condenser Fan Relay (K109). The relay de-energises, removing the voltage supply to the Condenser Fan Motors (M113, M121).