Workshop Manuals Factory service & repair Subaru
01 Relays and Modules02 Sensors and Switches03 Maintenance04 Engine, Cooling and Exhaust05 Powertrain Management06 Transmission and Drivetrain07 Brakes and Traction Control08 Starting and Charging09 Power and Ground Distribution10 Steering and Suspension11 Heating and Air Conditioning12 Restraint Systems13 Accessories and Optional Equipment14 Body and Frame15 Cruise Control16 Instrument Panel, Gauges and Warning Indicators17 Lighting and Horns18 Windows and Glass19 Wiper and Washer Systems
Subaru Legacy F4-2.5L SOHC (2003)03 · Maintenance
03 · Maintenance

Coolant: Specifications (page 3 of 5)

Make
Subaru
Model
Legacy F4-
Engine
2.5L SOHC
Year
2003
Section
Fluids › Coolant
MaintenanceSpecifications · page 3 of 5
background image

Coolant: Testing and Inspection

INSPECTION 

RELATIONSHIP OF SUBARU COOLANT CONCENTRATION AND FREEZING TEMPERATURE 

The concentration and safe operating temperature of the SUBARU coolant is shown in the diagram. Measuring 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).

PROCEDURE TO ADJUST THE CONCENTRATION OF THE COOLANT 

To adjust the concentration of the 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 coolant that should be replaced can be determined using the diagram.

[Example]
Assume that the coolant concentration must be increased from 25% to 40%. Find point A, where the 25% line of coolant concentration intersects with
the 40% curve of the necessary 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 liters (2.2 US qt. 1.8 Imp qt). Drain 2.1 liters (2.2 US qt. 1.8 Imp qt) of coolant from the cooling system and add 2.1 liters (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.

Pinch or Ctrl + scroll to zoom. Double-tap to reset.

Parts & tools for this job For 2003 Subaru Legacy 2.5L

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.