Daewoo MATIZ - Cooling System Diagnosis

1D–8 ENGINE COOLING
DAEWOO M-150 BL2
COOLING SYSTEM DIAGNOSIS
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Condition
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Probable Cause
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Correction
Engine Overheats
D A loss of the coolant. D Add the coolant.
D A weak coolant solution. D Confirm that the coolant solution is a
50/50 mixture of ethylene glycol and
water.
D Any dirt, any leaves, or any insects
on the front of the radiator.
D Clean the front of the radiator.
D The leakage from the hoses, the
coolant pump, the heater, the
thermostat housing, the radiator, the
heater core, or the head gasket.
D Replace any damaged components.
D A faulty thermostat. D Replace a damaged thermostat.
D Retarded ignition timing. D Perform an ECM code diagnosis.
D Confirm the integrity of the timing
belt.
D An improperly operating electric
cooling fan.
D Replace the electric cooling fan.
D Plugged or rotted radiator hoses. D Replace any damaged radiator
hoses.
D A faulty water pump. D Replace a faulty water pump.
D A faulty surge tank cap. D Replace a faulty surge tank cap.
D A cracked or plugged cylinder head
or engine block.
D Repair the damaged cylinder head or
the damaged engine block.
D A faulty radiator. D Replace a faulty radiator.
Loss of Coolant
D A leak in the radiator. D Replace a damaged radiator.
D A leak in the surge tank or the hose. D Replace the surge tank or the hose.
D Looseness or damage of radiator
hoses, heater hoses, or connections.
D Reseat the hoses.
D Replace the hoses or the clamps.
D Leaks in the coolant pump seal. D Replace the coolant pump seal.
D Leaks in the coolant pump gasket. D Replace the coolant pump gasket.
D An improper cylinder head torque. D Tighten the cylinder head bolts to
specifications.
D Replace the cylinder head gasket, if
needed.
D Leaks in the intake manifold, cylinder
head gasket, heater core.
D Repair or replace any components,
as needed to correct the leak.
Engine Fails to Reach
Normal Operating
D Thermostat to be stuck open or to be
wrong type.
D Install a new thermostat of the
correct type and heat range.
Temperature or Cool Air
from the Heater
D The coolant level below the MIN
mark on the surge tank.
D Add sufficient coolant to raise the
fluid to the specified mark on the
surge tank.