Troubleshooting Chart

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

Symptom			Check items
Cooling system parts malfunction	Poor heat transfer	Water pump malfunction	Worn or loose drive belt	--
		Coolant Circulation	Thermostat
		Damaged fins	Dust contamination or paper clogging
			Physical damage
		Clogged radiator cooling tube	Excess foreign material (rust, dirt, sand, etc.)
	Reduced airflow	Cooling fan does not operate	Fan assembly	--
		High resistance to fan rotation
		Damaged fan blades
	Damaged radiator shroud	--	Radiator shroud	--
	Improper engine coolant mixture ratio	--	Engine coolant viscosity	--
	Poor engine coolant quality	--		--
	Insufficient engine coolant	Engine coolant leaks	Cooling hose	Loose clamp
				Cracked hose
			Heater pump	Physical damage
			Water pump	Poor sealing
			Radiator or reservoir cap	Loose
				Poor sealing
			Radiator	O-ring for damage, deterioration or improper fitting
				Cracked radiator tank
				Cracked radiator core
			Reservoir tank	Cracked reservoir tank
		Overflow reservoir tank	Exhaust gas leaks into cooling system	Cylinder head deterioration
				Cylinder head gasket deterioration
Except cooling system parts malfunction	--	Overload on engine	Abusive driving	High engine RPM under no load
				Driving in low gear for extended time
				Driving at extremely high speed
			Powertrain system malfunction	--
			Improper size wheels and tires installed
			Dragging brakes
			Improper ignition timing
	Blocked or restricted airflow	Blocked bumper	Car brassiere installed	--
		Blocked radiator grille
			Mud contamination or paper clogging
		Blocked radiator	Blocked air flow
		Blocked condenser
		Installed large fog lamp