Cooling System Heat Problem; Cooling System Recommendation - Daewoo G424 Gasoline Service Manual

Cooling System Heat Problems
To check if there is a good reason for heat problems
do the checks that follow:
1. The indications of a heat problem are as follows:
a. High coolant temperature indicator light is on or
needle of coolant temperature gauge is in red
range.
b. Coolant boils out (comes out because of too
much heat) of the cooling system during
operations.
c. Coolant boils out on the floor when the engine is
stopped.
d. Coolant must be added at the end of each shift
but Steps b and c are not present.
2. If indication in Step 1 a is only present. It is possible
the problem is only a damaged gauge, light or
sender. Make a replacement of the defective part.
3. If indication in Step 1b is present, do the procedure
that follows:
a. Run the engine at medium idle (1200 rpm) for
three minutes after high idle operation. This cools
off the hottest parts of the engine before it is
stopped.
b. Install a coolant recovery system on the truck, if
not already equipped.
4. If indications in Step 1b, 1c or 1d are present, but
Step 1a is not and the high temperature indicator
light does work, the problem can be a damaged
radiator cap seal or there can be a leak in the
cooling system. Complete the procedure that
follows:
a. Do the Pressure Cap Test, Cooling System Leak
Check, Thermostat Test and Belt Adjustment in
the Testing And Adjusting.
b. Clean the radiator with hot water (steam clean)
at low pressure and use detergent or air
according to the different types of debris that
caused the radiator to be dirty (plugged).
c. Check the engine high idle setting.
NOTE: Another condition that can cause heat
problems is the ignition timing. Retarded (late) timing
causes the engine to send more heat to the cooling
system. Advanced (early) timing causes the engine to
send less heat to the cooling system.
G424 Service Manual

Cooling System Recommendation

Coolant Information
DAEWOO recommends that the coolant mix contain
50% commercially available automotive antifreeze,
and 50% water.
The coolant mixture of less than 30% concentration
does not provide sufficient corrosion protection.
Concentrations over 60% adversely affect freeze
protection and heat transfer rates.
To prevent damage to your engine, never add coolant to
an overheated engine. Allow the engine to cool first.
If the lift truck is to be stored in, or shipped to, an area
with freezing temperatures, the cooling system must
be protected to the lowest expected outside (ambient)
temperature.
The engine cooling system is protected with a
commercially available automotive antifreeze, when
shipped from the factory.
Check the specific gravity of the coolant solution
frequently in cold weather to ensure adequate
protection.
Clean the cooling system if it is contaminated, if the
engine overheats or if foaming is observed in the
radiator.
Old coolant should be drained, system cleaned and
new coolant added as recommended with the
commercially available automotive antifreeze.
Filling at over 20 liters per minute can cause air
pockets in the cooling system.
After draining and refilling the cooling system,
operate the engine with the radiator cap removed until
the coolant reaches normal operating temperature and the
coolant level
necessary to fill the system to the proper level.
Operate with a thermostat in the cooling system all
year-round. Cooling system problems can arise
without a thermostat.
114
NOTICE
stabilizes. Add coolant
Cooling System
as