Troubleshooting Chart

WARNING: This page is about a different car, the 2019 Infiniti QX60. 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	Engine coolant circulation
		Thermostat stuck closed	Thermostat
		Damaged radiator fins	Dust contamination or paper clogging	--
			Physical damage
		Clogged radiator cooling tube	Excess foreign material (rust, dirt, sand, etc.)
	Reduced air flow	Cooling fan motor assembly does not operate	Cooling fan motor 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	--	Engine coolant density	--
	Insufficient engine coolant	Engine coolant leaks	Radiator and heater hoses	Loose clamp
				Cracked hose
			Water pump	Poor sealing
			Radiator cap	Loose
				Poor sealing
			Radiator	O-ring for damage, deterioration or improper fitting
				Cracked radiator tank
				Cracked radiator core
			Coolant reservoir tank	Cracked coolant reservoir tank
		Overflowing coolant 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
			Brakes dragging
			Improper ignition timing
	--	Blocked or restricted air flow	Blocked bumper	--
			Blocked condenser
			Blocked radiator
			Blocked radiator grille
			Car brassiere installed
			Large fog lamp installed
			Mud contamination or paper clogging