Cooling System - Subaru Impreza 2003 Service Manual

11.Cooling System

A: INSPECTION
1) Check the radiator for leakage, filling it with cool-
ant and attach the radiator cap tester (A) to filler
neck. Then apply a pressure.
Check the following points:
Non-turbo model
157 kPa (1.6 kg/cm
Turbo model
122 kPa (1.2 kg/cm
• Each portion of radiator for leakage
• Hose joints and other connections for leakage
NOTE:
• For turbo model, be sure to install the tester to fill-
er tank side.
• When attaching or detaching tester and when
operating tester, use special care not to deform ra-
diator filler neck.
NON-TURBO MODEL
TURBO MODEL
• When performing this check, be sure to keep the
engine stationary and fill the radiator with coolant.
• Wipe off check points before applying pressure.
• Use care not to spill coolant when detaching the
tester from radiator.
• Do not remove the radiator side cap. (Turbo
model)
2) Check the radiator cap valve open pressure us-
ing radiator cap tester.
COOLING SYSTEM
2
, 23 psi)
2
, 18 psi)
(A)
PM-00128
(A)
PM-00150
PERIODIC MAINTENANCE SERVICES
NOTE:
Rust or dirt on the cap may prevent the valve from
functioning normally: be sure to clean the cap be-
fore testing.
Raise the pressure until the needle of gauge stops
and see if the pressure can be retained for 5 to 6
seconds. The radiator cap is normal if a pressure
above the service limit value has been maintained
for this period.
Radiator cap valve open pressure
Non-turbo model
Standard value:
93 — 123 kPa (0.95 — 1.25 kg/cm
psi)
Service limit:
83 kPa (0.85 kg/cm
Turbo model
Filler tank side:
Standard value:
93 — 123 kPa (0.95 — 1.25 kg/cm
psi)
Service limit:
83 kPa (0.85 kg/cm
Radiator side:
Standard value:
122 — 152 kPa (1.24 — 1.55 kg/cm
22 psi)
Service limit:
112 kPa (1.14 kg/cm
(A)
(A) Deformation
(B) Deformation, damage, rust
PM-23
2
, 14 — 18
2
, 12 psi)
2
, 14 — 18
2
, 12 psi)
2
, 18 —
2
, 16 psi)
PM-00023
(A)
(B)
PM-00089