Ranger 4WD V6-245 4.0L VIN X SFI (1999)
Coolant Line/Hose: Testing and Inspection
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:
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Visible signs of deterioration such as cracking or checking. Replace them if there is visible deterioration.
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Swelling near the clamps and at the hose ends. Replace them if there is swelling.
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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, replace it.
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Cuts. If a hose is cut other than a very superficial cut, replace the hose.
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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, replace it.
2. Inspect the clamps.
