Coolant: Testing and Inspection

INSPECTION

1. Check radiator for leakage, filling it with coolant and attach radiator cap tester to the tiller neck.Then apply a pressure of 157 kPa (1.6 kg/sq.cm, 23 psi) and check the following points:
- Each portion of radiator for leakage.
- Hose joints and other connections for leakage.


CAUTION: When attaching or detaching tester and when operating tester, use special care not to deform radiator filler neck.


NOTE:
- 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.

2. Check the radiator cap valve open pressure using radiator cap tester.


CAUTION: Rust or dirt on cap may prevent valve from functioning normally: be sure to clean cap before testing.

- 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 pressure above the service limit value has been maintained for this period.







Radiator cap valve open pressure
Standard value:
93 - 123 kPa
(0.95- 1.25 kg/sq.cm, 13.5-17.8 psi)
Service limit:
83 kPa (0.85 kg/sq.cm, 12.0 psi)

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 tan does not operate when coolant temperature exceeds 90 to 94°C (194 to 201°F), check thermoswitch or fan motor.

To prevent cooling system leaks, always add Genuine Subaru cooling system Conditioner (Part No. SOA635071) whenever the coolant is replaced.

The content of this article/image reflects the changes called out by TSB - 18-74-04-mu.