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Main 12 Causes of Overheating

ENGINE SPEED SPECIFICATION

Engine Step Inspection item Equipment Standard Reference
OFF 1
  • Blocked radiator
  • Blocked condenser
  • Blocked radiator grille
  • Blocked bumper
  • Visual
 No blocking -
2
  • Coolant mixture
  • Coolant tester
 Refer to [ENGINE COOLANT: SYSTEM INSPECTION ]
3
  • Coolant level
  • Visual
 Coolant up to MAX level in reservoir tank and radiator filler neck See [CHANGING ENGINE COOLANT ]
4
  • Radiator cap
  • Pressure tester
 See [ENGINE COOLANT: SYSTEM INSPECTION ]
ON(1) 5
  • Coolant leaks
  • Visual
 No leaks See [ENGINE COOLANT: SYSTEM INSPECTION ]
ON(1) 6
  • Thermostat
  • Touch the upper and lower radiator hoses
 Both hoses should be hot See [ENGINE COOLANT: SYSTEM INSPECTION ]
ON(1) 7
  • Cooling fan
  • Visual
 Operating See [COOLING FAN: EXPLODED VIEW ]
OFF 8
  • Combustion gas leak
  • Color checker chemical tester 4 Gas analyzer
 Negative -
ON(2) 9
  • Coolant temperature gauge
  • Visual
 Gauge less than 3/4 when driving -
  • Coolant overflow to reservoir tank
  • Visual
 No overflow during driving and idling See [CHANGING ENGINE COOLANT ]
OFF(3) 10
  • Coolant return from reservoir tank to radiator
  • Visual
 Should be initial level in reservoir tank See [ENGINE COOLANT: SYSTEM INSPECTION ]
OFF 11
  • Cylinder head
  • Straight gauge feeler gauge
 0.1 mm (0.004 in) Maximum distortion (warping) See [CYLINDER HEAD: EXPLODED VIEW (1) ]
12
  • Cylinder block and pistons
  • Visual
 No scuffing on cylinder walls or piston See [OVERHEATING CAUSE ANALYSIS: TROUBLESHOOTING CHART ]
(1) Engine running at 3, 000 RPM for 10 minutes.
(2) Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
(3) After 60 minutes of cool down time.

For more information, refer to [OVERHEATING CAUSE ANALYSIS: TROUBLESHOOTING CHART ]

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