NO.17 COOLING SYSTEM CONCERNS-OVERHEATING[L3 Turbo]

id0103b4802300

17

COOLING SYSTEM CONCERNS-OVERHEATING

DESCRIPTION

Engine runs at higher than normal temperature/overheats.

POSSIBLE CAUSE

•  Improper coolant level

•  Blown fuse

•  Coolant leakage (engine internal, turbocharger, external)

•  Excessive A/C system pressure

•  A/C system operation is improper

•  Improper water/anti-freeze mixture

•  Fans reverse rotation

•  Poor radiator condition

•  Thermostat malfunction

•  Radiator hose damage

•  Cooling fan inoperative

•  Condenser fan inoperative

•  Improper or damaged radiator cap

•  Coolant overflow system malfunction

•  Improper drive belt tension

•  Drive belt damage

17	COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION	Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE	• Improper coolant level • Blown fuse • Coolant leakage (engine internal, turbocharger, external) • Excessive A/C system pressure • A/C system operation is improper • Improper water/anti-freeze mixture • Fans reverse rotation • Poor radiator condition • Thermostat malfunction • Radiator hose damage • Cooling fan inoperative • Condenser fan inoperative • Improper or damaged radiator cap • Coolant overflow system malfunction • Improper drive belt tension • Drive belt damage

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Inspect for the following: • Engine coolant level • Coolant leakage (around heater unit in passenger compartment, coolant hoses and/or radiator.) • Water and anti-freeze mixture • Radiator condition • Collapsed or restricted radiator hoses • Radiator pressure cap • Coolant overflow system • Fan rotational direction • Fan rotation direction • Fuses Are all items normal?	Yes	Go to the next step.
1		No	Service if necessary. Repeat Step 1.Service if necessary.
2	Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Is there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC test.
2		No	No DTC is displayed: Go to the next step.
3	Perform the KOEO and KOER self-test function using the M-MDS. (See KOEO/KOER SELF TEST[L3 Turbo].) Is there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC test.
3		No	No DTC is displayed: Go to the next step.
4	Start the engine and run it at idle speed. Turn the A/C switch off. Does the A/C compressor disengaged?	Yes	Go to the next step.
4		No	Go to symptom troubleshooting "NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY." (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY[L3 Turbo].)
5	Perform the Cooling Fan Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION[L3 Turbo].) Does the cooling fan system operate properly?	Yes	Go to the next step.
5		No	Repair or replace malfunctioning part, according to inspection results.
6	Is the drive belt normal?	Yes	Go to the next step.
6	Is the drive belt normal?	No	Replace the drive belt.
7	Is there any leakage around heater unit in passenger compartment?	Yes	Inspect and service heater unit for leakage.
7		No	Go to the next step.
8	Is there any leakage at coolant hoses and/or radiator?	Yes	Replace the malfunctioning part.
8	Is there any leakage at coolant hoses and/or radiator?	No	Go to the next step.
9	Cool down the engine. Remove the thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION[L3 Turbo].) (See THERMOSTAT INSPECTION[L3 Turbo].) Is thermostat normal?	Yes	Thermostat is normal. Inspect the cylinder block for leakage or blockage.
9		No	Access the ECT PID using the M-MDS. Inspect for both ECT PID and temperature gauge readings. If the temperature gauge on instrument cluster indicates normal but ECT PID is not same as temperature gauge reading, inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION[L3 Turbo].) If the temperature gauge on instrument cluster indicates overheating but ECT PID is normal, inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION.)
10	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.