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jury. This fan is electric and can turn ON whether or
not the engine is running.
Caution: If a fan blade is bent or damaged in any
way, no attempt should be made to repair or reuse
the damaged part. A bent or damaged fan assembly
should always be replaced with a new one.
The cooling fans are mounted behind the radiator in the
engine compartment. The electric cooling fans increase
the flow of air across the radiator fins and across the
condenser on air conditioner (A/C)-equipped vehicles.
This helps to speed cooling when the vehicle is at idle or
moving at low speeds.
The main fan size is 320 mm (12.6 inches) in diameter
with five blades to aid the airflow through the radiator
and the condenser. An electric motor attached to the ra-
diator support drives the fan.
A/C models have two fans – the main fan, and the auxil-
iary fan. The auxiliary fan is 250 mm (9.8 inches) in di-
ameter. Non-A/C models have only the main fan.
A/C OFF or Non-A/C Model
The cooling fan(s) are actuated by
the engine control module (ECM) using a
low-speed cooling fan relay and a high-speed cooling
fan relay. On A/C-equipped vehicles, a series/parallel
cooling fan relay is also used.
The ECM will turn the cooling fan(s) on at
low speed when the coolant temperature reaches
93 C (199 F) and high speed at 97 C (207 F).
The ECM will change the cooling fan(s)
from high speed to low speed at 94 C (201 F) and
turn the cooling fans off at 90 C (194 F).
A/C ON
The ECM will turn the cooling fans on at
low speed when the A/C system is on. The
DAEWOO T-154 BL2,3
ENGINE COOLING 1D – 20
ECM will change to high speed when the coolant
temperature reaches 115 C (239 F) or high-side A/C
pressure reaches 1 882 kPa (273 psi).
The cooling fans will return to low speed when the
coolant temperature reaches 112 C (234 F) and
high-side A/C pressure reaches 1 448 kPa (210 psi).
ENGINE COOLANT TEMPERATURE
SENSOR
The Engine Coolant Temperature (ECT) sensor uses a
thermistor to control the signal voltage to the
engine control module
(ECM).
COOLANT TEMPERATURE GAUGE
The coolant temperature gauge controls the instrument
panel temperature indicator. The coolant temperature
gauge is located on the intake manifold near the throttle
body on an SOHC engine, and on the cylinder head, un-
der the intake manifold on a DOHC engine.
ENGINE BLOCK HEATER
The vehicle is designed to accept an engine block heat-
er. The engine block heater helps warm the engine for
improved cold-weather starting. It can also help reduce
fuel consumption when a cold engine is warming up.
The engine block heater utilizes an existing expansion
plug for installation and is located under the intake man-
ifold.
Contact your Daewoo dealer for further information or
installation.
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