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Main 12 Causes of Overheating
NGEC1056
Engine Step Inspection item Equipment Standard Reference page
OFF 1 쐌 Blocked radiator
쐌 Blocked condenser
쐌 Blocked radiator grille
쐌 Blocked bumper
쐌 Visual No blocking —
2 쐌 Coolant mixture 쐌 Coolant tester 50 - 50% coolant mixture See MA-13, “RECOM-
MENDED FLUIDS AND
LUBRICANTS”.
3 쐌 Coolant level 쐌 Visual Coolant up to MAX level
in reservoir tank and
radiator filler neck
See MA-26, “Changing
Engine Coolant”.
4 쐌 Radiator cap 쐌 Pressure tester 59 - 98 kPa
(0.6 - 1.0 kg/cm
2
,9-14
psi) (Limit)
See LC-26, “System
Check”.
ON*
2
5 쐌 Coolant leaks 쐌 Visual No leaks See LC-26, “System
Check”.
ON*
2
6 쐌 Thermostat 쐌 Touch the upper and
lower radiator hoses
Both hoses should be
hot
See LC-29, “Thermostat”
and LC-31, “Radiator”.
ON*
1
7 쐌 Cooling fan
(Crankshaft driven)
쐌 Visual Operating See LC-32, “Cooling Fan”.
OFF 8 쐌 Combustion gas leak 쐌 Color checker chemi-
cal tester 4 Gas ana-
lyzer
Negative —
ON*
3
9 쐌 Coolant temperature
gauge
쐌 Visual Gauge less than 3/4
when driving
—
쐌 Coolant overflow to
reservoir tank
쐌 Visual No overflow during driv-
ing and idling
See MA-26, “Changing
Engine Coolant”.
OFF*
4
10 쐌 Coolant return from
reservoir tank to radia-
tor
쐌 Visual Should be initial level in
reservoir tank
See MA-25, “ENGINE
MAINTENANCE”.
OFF 11 쐌 Cylinder head 쐌 Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See EM-88, “Inspection”.
12 쐌 Cylinder block and pis-
tons
쐌 Visual No scuffing on cylinder
walls or piston
See EM-104, “Inspection”.
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time.
For more information, refer to LC-34, “OVERHEATING CAUSE ANALYSIS”.
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT
PROTECTION (WITHOUT ELECTRIC COOLING FAN)
VG33E
Main 12 Causes of Overheating
EC-926
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