Subaru 2009 IMPREZA Service Manual page 1194

COOLING
3. Engine Coolant
A: REPLACEMENT
1. DRAINING OF ENGINE COOLANT
1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Remove the drain plug to drain engine coolant
into container.
NOTE:
Remove the coolant filler tank cap so that engine
coolant will drain faster.
5) Install the drain plug.
6) Install the under cover.
2. FILLING OF ENGINE COOLANT
1) Pour cooling system conditioner through the fill-
er neck.
Cooling system protective agent:
Refer to "SPECIFICATION" for cooling sys-
tem protective agent. <Ref. to CO(H4DOTC)-
2, SPECIFICATION, General Description.>
2) Fill the engine coolant into coolant filler tank up
to the filler neck position.
Recommended engine coolant:
Refer to "SPECIFICATION" for recommended
engine coolant. <Ref. to CO(H4DOTC)-2,
SPECIFICATION, General Description.>
Engine coolant level:
Refer to "SPECIFICATION" for engine cool-
ant level. <Ref. to CO(H4DOTC)-2, SPECIFI-
CATION, General Description.>
Engine coolant concentration:
Refer to "ADJUSTMENT" for the recommend-
ed engine coolant concentration. <Ref. to
CO(H4DOTC)-15, ADJUSTMENT, Engine
Coolant.>
CAUTION:
Do not confuse the cap of coolant filler tank and
cap of radiator.
Engine Coolant
NOTE:
• When pouring the engine coolant, the radiator
side cap must not be removed.
• The SUBARU Super Coolant contains anti-
freeze and anti-rust agents, and is especially made
for Subaru engines with an aluminum cylinder
block. Always use SUBARU Super Coolant, since
other coolant may cause corrosion.
3) Fill engine coolant into the reservoir tank up to
"FULL" level.
4) Close the coolant filler tank cap, and start the en-
gine. Race 5 to 6 times at 3,000 rpm or less, then
stop the engine. (Complete this operation within 40
CO-02501
seconds.)
5) Wait for one minute after the engine stops, then
open the coolant filler tank cap. If the engine cool-
ant level drops, add engine coolant into the coolant
filler tank up to the filler neck position.
6) Perform the procedures 4) and 5) again.
7) Install the coolant filler tank cap and reservoir
tank cap properly.
8) Start the engine and operate the heater at max-
imum hot position and the blower speed setting to
"LO".
9) Run the engine at 2,000 rpm or less until radiator
fan starts and stops.
NOTE:
Be careful with the engine coolant temperature
gauge to prevent overheating.
10) Stop the engine and wait until the engine cool-
ant temperature lowers to 30°C (86°F) or less.
11) Open the coolant filler tank cap. If the engine
coolant level drops, add engine coolant into the
coolant filler tank up to the filler neck position and
the reservoir tank to "FULL" level.
12) Install the coolant filler tank cap and reservoir
tank cap properly.
13) Set the heater setting to maximum hot position
and the blower speed setting to "LO" and start the
engine. Perform racing at 3,000 rpm or less. If the
flowing sound is heard from heater core, repeat the
procedures from step 9).
CO(H4DOTC)-14
FULL
LOW
CO-02492