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CONDITION POSSIBLE CAUSES CORRECTION FAN RUNS ALL THE TIME 1. Fan control sensors inoperative. 1. Check for DTC’s. Verify sensor 2. Fan control solenoid stuck 9 on 9 . 2. Check fan operation speeds. 3. Fan control solenoid harness 3. Check for DTC 1499. Repair as 4. Transmission temperature too 4. Check for transmission over 5. Engine coolant temperature too 5. (a) Check coolant level. Correct (b) Thermostat stuck. Replace (c) Water pump failed. Replace (d) Coolant flow restricted. Clean (e) Air flow over radiator obstructed. COOLING SYSTEM LEAKS ULTRAVIOLET LIGHT METHOD A leak detection additive is available through the parts The black light can be used in conjunction with a pres- 7 - 10 COOLING WK |