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DIAGNOSIS AND TESTING PRELIMINARY CHECKS ENGINE COOLING SYSTEM OVERHEATING Establish what driving conditions caused the com- plaint. Abnormal loads on the cooling system such as (1) PROLONGED IDLE, VERY HIGH AMBIENT TEMPERATURE, SLIGHT TAIL WIND AT IDLE, Driving techniques that avoid overheating are: end of normal range. • Increasing engine speed for more air flow is rec- ommended. (2) TRAILER TOWING: Do not exceed limits. (3) RECENT SERVICE OR ACCIDENT REPAIR: formed on vehicle that may effect cooling system. • Engine adjustments (incorrect timing) • Slipping engine accessory drive belt • Brakes (possibly dragging) • Changed parts (incorrect water pump) • Reconditioned radiator or cooling system refill- ing (possibly under filled or air trapped in system). NOTE: If investigation reveals none of the previous These charts are to be used as a quick-reference only. Refer to the group text for information. COOLING SYSTEM DIAGNOSIS–DIESEL ENGINE CONDITION POSSIBLE CAUSES CORRECTION TEMPERATURE GAUGE READS 1. Diesel engines, due to their 1. The low gauge reading may be 2. Is the temperature gauge 2. Check, the engine temperature 3. Is the temperature gauge 3. Check guage operation. Refer to 4. Coolant level low in cold ambient 4. Check coolant level in the coolant 5. Improper operation of internal 5. Inspect heater and repair as 7 - 8 COOLING SYSTEM WJ 2000 JEEP GRAND CHEROKEE |