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Hopefully you aren't using aftermarket sensors. Darts seem to prefer only Mopar sensors. The network code is likely wiring or a connector.
The radiator fan should turn on when you select AC or Defrost no matter what engine temp is doing.

28 - DTC-Based Diagnostics / MODULE, Body Control (BCM) / Diagnosis and Testing

U1009-67-LIN 2 BUS - SIGNAL INCORRECT AFTER EVENT
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Theory of Operation

The Body Control Module (BCM) is the Local Interconnect Network (LIN) master for the Humidity Sensor, Automatic High Beam Module (AHBM) and the Compass Module. The BCM monitors the LIN circuit for any concerns.

•When Monitored:
Continuously with the ignition on.

•Set Condition:
The BCM does not receive any response from the LIN devices.

Possible Causes

LIN BUS CIRCUIT OPEN
BODY CONTROL MODULE (BCM)

1.CHECK FOR AN ACTIVE DTC

1. Turn the ignition on.

2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

•Go To 2

No

•Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).


2.CHECK THE (D404) LIN BUS CIRCUIT FOR AN OPEN

1. Turn the ignition off.

2. Disconnect the BCM C8 harness connector.

3. Disconnect the Humidity Sensor harness connector.

4. Disconnect the AHBM harness connector.

5. Disconnect the Compass Module harness connector.

6. Measure the resistance or the (D404) LIN Bus circuit between the BCM C8 harness connector and the Humidity Sensor, Automatic High Beam Module (AHBM) and the Compass Module harness connectors.

Is the resistance above 5.0 Ohms?

Yes

•Repair the open in the (D404) LIN Bus circuit.
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).

No

•Replace the BCM in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Body Control - Removal) .
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).

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