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CONDITION POSSIBLE CAUSES CORRECTION COOLANT TEMPERATURE 1. Low coolant level. 1. Check coolant level. Add coolant, if 2. Incorrect/improperly operating 2. Replace cap with the correct rating 3. Loose drive belt on water pump/fan. 3. Check/replace belt or belt tensioner. 4. Inadequate air flow to the radiator. 4. Check/repair radiator core, fan 5. Radiator fins plugged. 5. Blow debris from fins. 6. Collapsed radiator hose. 6. Replace the hose. Check coolant 7. Improperly operating temperature 7. Verify that the gauge and 8. Improperly operating, incorrect or no 8. check and replace the thermostat. 9. Air in the cooling system. 9. (A) make sure the fill rate is not (B) Check for loose hose clamps. (C) If aeration continued, check for a 10. Inoperative water pump. 10. Check and replace the water pump. 11. Incorrect injection pump timing. 11. Verify pump timing marks are 12. Overfueled injection pump. 12. Repair or replace the injection 13. Plugged cooling passages in 13. Flush the system and fill with clean 14. Engine overloaded. 14. Verify that the engine load rating is COOLANT TEMPERATURE 1. Too much air flow across the 1. Check/repair viscous fan drive as 2. Incorrect thermostat or 2. Check and replace thermostat. 3. Temperature sensor or gauge 3. Verify that the gauge and sensor are 4. Coolant not flowing by temperature 4. Check and clean coolant passages. 9 - 8 ENGINE XJ DIAGNOSIS AND TESTING (Continued) 2000 JEEP CHEROKEE |