Subaru 2006 Legacy, Manual

Page: 2333 / 4302

CO(H6DO)-11
Engine Coolant
COOLING
B: INSPECTION
1. RELATIONSHIP OF SUBARU COOLANT
CONCENTRATION AND FREEZING TEM-
PERATURE
The concentration and safe operating temperature
of SUBARU coolant is shown in the diagram. Mea-
suring the temperature and specific gravity of the
coolant will provide this information.
[Example]
If the coolant temperature is 25°C (77°F) and its
specific gravity is 1.054, the concentration is 35%
(point A), the safe operating temperature is –14°C
(7°F) (point B), and the freezing temperature is –
20°C (–4°F) (point C).
2. PROCEDURE TO ADJUST THE CON-
CENTRATION OF THE COOLANT
To adjust the concentration of coolant according to
temperature, find the proper fluid concentration in
the above diagram and replace the necessary
amount of coolant with an undiluted solution of
SUBARU genuine coolant (concentration 50%).
The amount of engine coolant that should be re-
placed can be determined using the diagram.
[Example]
Assume that the engine coolant concentration must
be increased from 25% to 40%. Find point A, where
the 25% line of engine coolant concentration inter-
sects with the 40% curve of the necessary engine
coolant concentration, and read the scale on the
vertical axis of the graph at height A. The quantity
of coolant to be drained is 2.1
2
(2.2 US qt, 1.8 Imp
qt). Drain 2.1
2
(2.2 US qt, 1.8 Imp qt) of coolant
from the cooling system and add 2.1
2
(2.2 US qt,
1.8 Imp qt) of the undiluted solution of SUBARU
coolant.
If a coolant concentration of 50% is needed, drain
all the coolant and refill with the undiluted solution
only.
CO-02172
60%
(1.054)
1.000
1.010
1.020
1.030
1.040
1.050
1.060
1.070
1.080
1.090
1.100
Safe operating temperature
Freezing
temperature
Concentration
of coolant
Specific gravity of coolant
Coolant temperature
B
A
C
-40
(-40) (-22) (-4) (14) (32) (50) (68) (86)
( F)
(104)
-30 -20 -10
0 10 20 30 40
(77 F)
50%
40%
30%
20%
25 C
10%
C
CO-00012
10
0
1
2
3
(1.1,
0.9)
(2.1,
1.8)
(3.2,
2.6)
10% 15%
25%
20%
30%
35%
40%
45%
A
20 30 40 50
Concentration of coolant in vehicie
and quantity to be drained
Quantity of coolant to be drained (US qt, Imp qt)
Necessary Concentration
of coolant
Concentration of coolant in
the vehicie cooling system %
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