Coolant Temperature Above Normal - Gradual Overheat

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Symptom	Possible Cause	Action	Reference
Coolant Temperature Above Normal - Gradual Overheat	Active DTCs or high counts of inactive DTCs	Check for active and inactive DTCs.	Work Flow
	Charge-air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris	Inspect the charge-air cooler, air conditioner condenser, and radiator fins. Clean, if necessary.	System Inspection
	Coolant level is below specification	Check the coolant level. Check for external leak. Sample the oil and check for coolant in the oil (internal leak).	System Inspection Inspection
	Coolant mixture of antifreeze and water is not correct	Verify the concentration of antifreeze in the coolant. Add antifreeze or water to correct the concentration.	Engine Coolant Mixture Ratio
	Fan or fan shroud is damaged or missing or the air recirculation baffles are damaged or missing	Inspect the fan, fan shroud and the recirculation baffles. Repair, replace, or install, as necessary.	Exploded View
	Drive belt is broken or loose	Check the drive belt. Replace the belt, if necessary.	Inspection
	Fan drive or fan controls are malfunctioning	Check the fan drive and controls.	System Description
	Coolant temperature gauge or sensor is malfunctioning	Test the gauge or the sensor. Repair or replace, if necessary.	System Description
	Radiator cap is not correct, is malfunctioning, or has low-pressure rating	Check the radiator pressure cap.	System Inspection
	Thermostat is not correct or is malfunctioning	Check the thermostat for the correct part number and for correct operation.	System Inspection
	Cooling system hose is collapsed, restricted, or leaking	Inspect the hoses. Repair, or replace as necessary.	System Inspection
	Intake manifold air temperature is above specification	Refer to the Intake Manifold Air Temperature Above Specification symptom diagnosis.	Symptom Table
	Lubricating oil level is above or below specification	Check the oil level. Add or drain oil, if necessary.	Inspection
	Cooling system is contaminated with dirt, scale, or sludge	Flush the cooling system.	Changing Engine Coolant
	Lubricating oil is contaminated with coolant or fuel	Refer to the Lubricating Oil Contaminated symptom diagnosis.	Lubricating Oil Contaminated
	Coolant is contaminated with oil	Refer to the Lubricating Oil in Coolant symptom diagnosis.	Symptom Table
	Water pump is malfunctioning	Check water pump for correct operation. Replace the water pump, if necessary.	Removal and Installation
	Radiator fins are damaged or obstructed with debris	Inspect the radiator fins. Clean and repair the fins as necessary.	System Inspection
	Torque converter is malfunctioning	Check the torque converter.	Inspection and Judgment
	Air or combustion gases are entering the cooling system	Check for air or combustion gasses in the cooling system.	-
	Vehicle speed is too low for adequate cooling with high engine load	Reduce the engine load. Increase the engine (fan) RPM by downshifting.	-