Cooling System - Subaru 2003 Legacy Service Manual

11.Cooling System

A: INSPECTION
1) Check radiator for leakage, filling it with coolant
and attach radiator cap tester (A) to the filler neck.
Then apply a pressure of 157 kPa (1.6 kg/cm
psi) and check the following points:
• Each portion of radiator for leakage
• Hose joints and other connections for leakage
NOTE:
• 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 radiator with coolant.
• Wipe off check points before applying pressure.
• Use care not to spill coolant when detaching
tester from radiator.
COOLING SYSTEM
2
, 23
( A )
PM-00128
( A )
CO-00043
PERIODIC MAINTENANCE SERVICES
2) Check the radiator cap valve open pressure us-
ing radiator cap tester.
NOTE:
Rust or dirt on cap may prevent valve from func-
tioning normally: be sure to clean cap before test-
ing.
Raise the pressure until the needle of gauge stops
and see if the pressure can be retained for five to
six seconds. The radiator cap is normal if a pres-
sure above the service limit value has been main-
tained for this period.
Radiator cap valve open pressure
Standard value:
93 — 123 kPa (0.95 — 1.25 kg/cm
psi)
Service limit:
83 kPa (0.85 kg/cm
(A)
(A) Check position for deformation
(B) Check position for deformation, damage and
rust.
3) If the coolant temperature exceeds 76.0 to
80.0°C (169 to 176°F) while radiator is not so hot,
check thermostat. If thermostat does not open at
76.0 to 80.0°C (169 to 176°F), replace it with a new
one.
4) If electric fan does not operate when coolant
temperature exceeds 95°C (203°F), check the
electric fan system.
PM-21
2
, 14 — 18
2
, 12 psi)
PM-00023
(A)
(B)
PM-00089