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RECENT SERVICE OR ACCIDENT REPAIR: Determine if any recent service has been per- formed on vehicle that may effect cooling system. • Engine adjustments (incorrect timing) • Slipping engine accessory drive belt(s) • Brakes (possibly dragging) • Changed parts. Incorrect water pump or pump rotating in wrong direction due to belt not correctly • Reconditioned radiator or cooling system refill- ing (possibly under filled or air trapped in system). NOTE: If investigation reveals none of the previous refer to COOLING SYSTEM DIAGNOSIS CHART BELOW. These charts are to be used as a quick-reference only. Refer to COOLING SYSTEM DIAGNOSIS COOLING SYSTEM DIAGNOSIS CHART CONDITION POSSIBLE CAUSES CORRECTION TEMPERATURE GAUGE READS 1. Has a Diagnostic Trouble Code 1. (Refer to 25 - EMISSIONS 2. Is the temperature sending unit 2. Check the temperature sensor 3. Is the temperature gauge 3. Check gauge 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 AN COOLING (Continued) |