Overheating Cause Analysis: Troubleshooting Chart
| Symptom | Check items | |||
|---|---|---|---|---|
| Cooling system parts malfunction | Poor heat transfer | Water pump malfunction | Worn or loose drive belt | |
| Thermostat and water control valve 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 operate | Fan assembly | ||
| High resistance to fan rotation | ||||
| 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, deterioration 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 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 | ||||
| Power train system malfunction | ||||
| Installed improper size wheels and tires | ||||
| Dragging brakes | ||||
| Improper ignition timing | ||||
| 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 | ||||
OVERHEATING CAUSE ANALYSIS - TROUBLESHOOTING CHART
Engine Coolant: System Inspection
Refer to [ ENGINE COOLANT SYSTEM INSPECTION [QR25DE] ].
INSPECTION AFTER INSTALLATION
- Check for leaks of engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up engine. Visually check there are no leaks of engine coolant and A/T fluid.
- Check for leaks of the engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
Scheme 7
- Check for leaks of engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up the engine. Visually check if there is no leaks of engine coolant.
Scheme 8
- Check for leaks of engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up the engine. Visually check if there is no leaks of engine coolant.
- Check for leaks of engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up the engine. Visually check if there is no leaks of engine coolant.
Scheme 9
- Check for leaks of engine coolant. Refer to [ «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375740-S15754189982010102800000) ].
- Start and warm up engine. Visually make sure that there is no leaks of engine coolant.