Cooling System Hoses

1. CAUTION: Cooling system hoses, which operate under a positive pressure of approximately 110 kPa (16 psi) and a temperature of over 95°C (200°F), are subject to considerable vibration. Any hoses with cuts or deterioration should be replaced, as they are likely to fail on the road with the attendant risk of engine damage.

CAUTION: Reasonably fresh replacement hoses should be used. Replacement hoses which have been in storage for several years should be checked for ozone-caused hardening. Hoses which have become hard will be difficult to seal and may break in service.

Inspect the hoses for:
- Visible signs of deterioration such as cracking or checking. Install a new hose if there is visible deterioration.
- Swelling near the clamps and at the hose ends. Install a new hose if there is swelling.
- Oil or oily dirt on the hoses from engine oil leaks or careless filling. Clean off the oil and oily dirt on the hoses. Oil will attack the rubber over time. If there is weakening or deterioration of a hose, install a new hose.
- Cuts. If a hose is cut other than a very superficial cut, install a new hose.
- A hose contacting metal parts, especially sharp edges. If a hose is contacting metal parts, loosen the clamps and relocate the hose. In some cases it may be necessary to put plastic shielding on the hose to protect it. If the hose has already been cut or worn, install a new hose.
2. Inspect the clamps for any damage.