NO.13 COOLING SYSTEM CONCERNS-COOLANT CONSUMPTION [MZ-CD 1.6]

id0103e4854600

13

Cooling system concerns-Coolant consumption

DESCRIPTION

•  Loss of coolant

•  Water in the air cleaner

POSSIBLE CAUSE

•  Poor sealing at cooling system components

―  Hose(s)/hose joint(s).

―  Coolant expansion tank cap or seal.

―  Coolant expansion tank.

―  Radiator.

―  Water pump.

―  Thermostat housing.

•  Heater core malfunction

•  Damaged gaskets or warped mating faces

•  Cracks or fractures in engine components surrounded by coolant, such as cylinder liners and cylinder head combustion chamber

•  Damaged engine internal part

13	Cooling system concerns-Coolant consumption
DESCRIPTION	• Loss of coolant • Water in the air cleaner
POSSIBLE CAUSE	• Poor sealing at cooling system components ― Hose(s)/hose joint(s). ― Coolant expansion tank cap or seal. ― Coolant expansion tank. ― Radiator. ― Water pump. ― Thermostat housing. • Heater core malfunction • Damaged gaskets or warped mating faces • Cracks or fractures in engine components surrounded by coolant, such as cylinder liners and cylinder head combustion chamber • Damaged engine internal part

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	VISUALLY INSPECT RELATED PART CONDITION • Visually inspect the following: Mechanical: ― Coolant leak(s) ― Coolant level ― Gaskets/seals ― Hose(s)/hose joints ― Coolant expansion tank cap and seal ― Coolant expansion tank ― Radiator ― Water pump ― Thermostat ― Thermostat housing ― Visibly damaged or worn parts ― Loose or missing nuts or bolts • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 1.
1		No	Go to the next step.
2	INSPECT COOLANT LEAKAGE AT HEATER UNIT • Visually inspect for leakage around heater unit in passenger compartment. • Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results.
2		No	Go to the next step.
3	INSPECT FOR ENGINE COOLANT LEAKAGE • Perform the ENGINE COOLANT LEAKAGE INSPECTION. (See ENGINE COOLANT LEAKAGE INSPECTION [MZ-CD 1.6].) • Is there any leakage detected?	Yes	Repair or replace the applicable part.
3		No	Go to the next step.
4	INSPECT CYLINDER HEAD GASKET • Remove the cylinder head. (See CYLINDER HEAD GASKET REPLACEMENT [MZ-CD 1.6].) • Visually inspect cylinder head gasket and mating surface. • Is there any damaged or mating face wrapped?	Yes	Replace the cylinder head gasket, and/or clean the mating surface as necessary.
4		No	Overhaul the engine and repair or replace as necessary. (Engine internal part is damaged.)
5	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZ-CD 1.6].) • If the malfunction remains, inspect the related Service 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.