The fans are turned on by the PCM, if the PCM is not telling the fans to turn on, they won't even if everything tests fine.
2005 Chrysler 300 V8-5.7L VIN H
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
ENGINE COOLANT TEMP SENSOR
REMOVAL
The Engine Coolant Temperature (ECT) sensor (3) on the 5.7L engine is located under the air conditioning compressor. It is installed into a water jacket at the front of the cylinder block.
WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE
PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR.
1. Partially drain the cooling system.
2. Remove accessory drive belt.
3. Carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support
compressor to gain access to ECT sensor (3).
4. Disconnect electrical connector (2) from sensor (3).
5. Remove sensor (3) from cylinder block.
INSTALLATION
1. Apply thread sealant to sensor threads.
2. Install ECT sensor (3) to engine.
3. Tighten sensor to 11 Nm (97.3 inch lbs.) torque.
4. Connect electrical connector (2) to ECT sensor (3).
5. Fill the cooling system.
I had a problem similar to this. The cheap fix is to replace the Engine Coolant Temperature Sensor. This will have two wires that come into a wiring harness located near your thermostat housing. It sounds like there is a problem with your sensor to PCM operation. This would cause your fans not to operate when the coolant was reaching temperature. If this doesn't fix the problem, I would look into a new PCM (mine ended up being the PCM itself).
HAVE YOU CHECKED THE TEMPERATURE SENDING UNIT? IT MAY NOT BE SENDING THE SIGNAL TO THE FANS IF IT IS DEFECTIVE. I HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR USING FIX-YA. ANY COMMENTS ARE WELCOME. GOOD LUCK.
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