NO.13 COOLING SYSTEM CONCERNS-OVERHEATING [WLT-1, WLT-2]

id010396913300

13
Cooling system concerns-overheating
DESCRIPTION
•  The engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
•  Cooling fan malfunction
•  Low drive belt tension
•  Drive belt damage
•  Improper coolant level
•  Thermostat malfunction
•  Radiator clogging
•  Water temperature gauge or sender unit malfunction
•  Improper or damaged radiator cap
•  Radiator hose damage
•  Coolant leakage (engine internal, turbocharger, external)
•  A/C system malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Inspect the following:
―  Engine coolant level
―  Coolant leakage
―  Radiator condition
―  Collapsed or restricted radiator hoses
―  Radiator pressure cap
―  Drive belt tension
―  Drive belt
•  Are the all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Note
•  The following test should be performed on vehicles with the A/C system. Go to Step 4 for vehicles without the A/C system.
•  Start the engine and run it at idle speed.
•  Turn the A/C switch off.
•  Does the A/C compressor disengage?
Yes
Go to the next step.
No
Go to symptom troubleshooting "NO.19 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY."
3
•  Inspect water temperature sender unit.
•  Is the water temperature sender unit normal?
Yes
Inspect thermostat.
No
Replace water temperature sender unit.
4
•  Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.