Nissan 350Z Workshop Maunual 2006 (11) PDF | Page 6

CO-6
OVERHEATING CAUSE ANALYSIS
Revision: 2005 August 2006 350Z
OVERHEATING CAUSE ANALYSIS PFP:00012
Troubleshooting Chart NBS0001R
Symptom Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction Worn or loose drive belt
?
Thermostat stuck closed ?
Damaged fins
Dust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
Fan assembly ?High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud ? ? ?
Improper engine coolant
mixture ratio
???
Poor engine coolant quality ? Engine coolant viscosity ?
Insufficient engine coolant
Engine coolant leaks
Cooling hose
Loose clamp
Cracked hose
Water pump Poor sealing
Radiator cap
Loose
Poor sealing
Radiator
O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leaks into
cooling system
Cylinder head deterioration
Cylinder head gasket dete-
rioration