Cooling System - Subaru 2001 LEGACY Service Manual

Periodic Maintenance Services

12. 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:
¼ Each portion of radiator for leakage
¼ Hose joints and other connections for leakage
NOTE:
¼ When attaching or detaching tester and when
operating tester, use special care not to deform
radiator filler neck.
¼ When performing this check, be sure to keep the
engine stationary and fill radiator with coolant.
¼ Wipe off check points before applying pressure.
¼ Use care not to spill coolant when detaching
tester from radiator.
2) Check the radiator cap valve open pressure
using 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
18 psi)
Service limit:
83 kPa (0.85 kg/cm
COOLING SYSTEM
SA07688
SA07688A10
2
GI0033A
2
, 14 —
2
, 12 psi)
, 23
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 90 to 94°C (194 to 201°F),
check thermoswitch or fan motor.
PM-20
GI0034
GI0035A