Nissan Leaf. Manual — part 842
SYSTEM
HCO-7
< SYSTEM DESCRIPTION >
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SYSTEM
High Voltage Cooling System
INFOID:0000000010119125
• The HV cooling system is the system which cools the following high-voltage components.
- Traction motor
- Traction motor inverter
- PDM (Power Delivery Module)
• Coolant is circulated by means of the electric water pump, and the electric water pump is controlled by the
VCM (Vehicle Control Module).
COOLING SYSTEM DIAGRAM
JPCIA0340ZZ
PDM (Power Delivery Module)
Electric water pump
Traction motor inverter
Traction motor
To reservoir tank
To radiator
To radiator
HCO-8
< SYSTEM DESCRIPTION >
SYSTEM
HIGH VOLTAGE COOLING SYSTEM SCHEMATIC
JPCIA0375GB
RADIATOR
HCO-9
< BASIC INSPECTION >
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BASIC INSPECTION
RADIATOR
Inspection
INFOID:0000000010119126
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:
• Be careful not to bend or damage radiator fins.
• When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan
assembly and horns. Then tape harness and harness connectors to prevent water from entering.
1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any stains no longer flow out from radiator.
4. Blow air into the back side of radiator core vertically downward.
• Use compressed air lower than 490 kPa (5 kg/cm
2
, 71 psi) and keep distance more than 30 cm (11.81
in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.
HCO-10
< SYMPTOM DIAGNOSIS >
OVERHEATING CAUSE ANALYSIS
SYMPTOM DIAGNOSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000010119127
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
—
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
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Improper coolant mixture ratio
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Poor coolant quality
Coolant viscosity
Insufficient coolant
Coolant leakage
Cooling hose
Loose clamp
Cracked hose
Water pump
Poor sealing
Degas tank 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
Degas tank
Cracked degas tank
Except cool-
ing system
parts mal-
function
Blocked or restricted air
flow
Blocked bumper
—
Blocked radiator grille
Installed car brassiere
Mud contamination or paper clogging
Blocked radiator
—
Blocked condenser
Blocked air flow
Installed large fog lamp
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