Daewoo Nexia Quiz
Cooling System

Cooling System Troubleshooting

In this manual: Cooling System
OWNER'S MANUAL — 12Vehicle Maintenance — 15Maintenance — 16Engine (Single Overhead Camshaft) — 50Engine (dual overhead camshafts) — 45Cooling System — 14Fuel and Exhaust Systems — 31Engine Electrical Equipment — 16Ignition System — 8Electronic Control Unit and Sensors — 12Clutch — 11Five-Speed Transmission and Final Drive RPO MM5 — 16Automatic Transmission — 46Wheels and Tires — 17Front Suspension — 13Front Axle Drive Shafts — 10Rear Suspension — 12Brake System — 54Body — 127Heating, Ventilation and Air Conditioning System — 21Electrical System — 7Wiring Diagrams — 25
~1min read
POSSIBLE CAUSES REMEDY
Engine overheats
Coolant level drops Top up coolant
Low antifreeze concentration in coolant Check antifreeze concentration in coolant
Loose belt tension or failure of

water pump belt

 Adjust the belt tension or replace the

belt
Radiator tubes and fins clogged

externally with insects, leaves, etc.

 Clean the radiator
Coolant leaks through leaks in the

hose connections, pump,

heater, thermostat housing,

radiator, drain cock or through the

cylinder head gasket

 Eliminate leaks, perform

necessary repair
Thermostat failure Check thermostat operation, if

necessary replace
Retarded ignition Adjust ignition timing
Electric fan failure Check the electric fan for proper operation.

If necessary,

replace the fan.
Radiator hoses clogged or

worn

 Replace hoses
Water pump failure Replace pump
Reservoir cap failure Replace cap
Cracks in cylinder head or block,

blockage of cooling jacket passages

 Repair
Coolant level drop
Leaks in radiator Inspect radiator, eliminate leaks
Leaks in expansion tank or in the

hose

 Replace tank or hose
Loose clamps or damaged

radiator or heater hoses

 Reconnect hose connections.

Replace hoses or clamps
Water pump seal failure Replace water pump
Water pump gasket failure Replace gasket
Incorrect cylinder head bolt tightening.

cylinder

 Tighten cylinder head bolts to the specified torque.

torque.

Replace gasket if necessary.

cylinder head
Leaks through:

– intake manifold.

– cylinder head gasket.

– cylinder block plug.

– heater core.

– heater valve (if

fitted)

 Eliminate leaks, repair

or replace defective parts and assemblies
Engine does not warm up to normal temperature
Thermostat valve stuck in the open

position or incorrect type.

thermostat

 Coolant level below MIN mark.

Replace thermostat.

Top up coolant

Test yourself

A quick Daewoo Nexia quiz: every answer comes with an explanation and a link to the manual page.