Step | Action | Value | Yes | No |
|---|---|---|---|---|
DEFINITION: Engine temperature lamp comes ON and stays ON, or the temperature gauge shows hot, or coolant overflows from the reservoir onto the ground while the engine is running. | ||||
1 | Check for a missing or damaged radiator upper baffle and/or center air deflector. Is the baffle or deflector missing or damaged? | -- | ||
2 | Check for a loss of coolant. Is there a loss of coolant? | -- | ||
3 | Fill the system to the specified level. Does the engine overheat? | -- | System OK | |
4 | Check for low coolant protection. Refer to Coolant Concentration Testing Is the coolant to the correct concentration? | -- | ||
5 | Check for a loss of system pressure. Refer to Pressure Cap Testing . Is there a loss of system pressure? | -- | ||
6 | Check for a faulty engine coolant temperature (ECT) sensor. Refer to DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage or DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage in Engine Controls-3.8L. or DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage or DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage in Engine Controls-5.7L. Is the sensor operating properly? | -- | ||
7 | Check for a damaged coolant recovery reservoir or a leaking hose. Refer to Coolant Recovery Reservoir Replacement . Is the reservoir cracked or is the hose leaking? | -- | ||
8 | Repair or install new parts as necessary, then retest. Does the engine overheat? | -- | System OK | |
9 | Check for incorrect drive belt tension. Refer to Drive Belt Replacement in Engine Mechanical-3.8L or Drive Belt Replacement in Engine Mechanical-5.7L. Is the belt to the correct tension? | -- | ||
10 | Check for a damaged water pump driveshaft (5.7L Only). Is the water pump driveshaft damaged or is the seal leaking? | -- | ||
11 | Check for obstructed radiator air flow or bent radiator fins. Is the radiator air flow obstructed? | -- | ||
12 | Check for blocked cooling system passages. Are the cooling system passages blocked? | -- | ||
13 | Check for an improper direction of inoperative cooling fans. Refer to Engine Cooling Fan Replacement . are the cooling fans and motors operating correctly? | -- | ||
14 | Check the thermostat. Refer to Thermostat Diagnosis . Is the thermostat stuck in the closed position? | -- | ||
15 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Does the engine overheat? | -- | System OK | |
16 | Check for a faulty water pump. Refer to Water Pump Replacement . Are the impeller blades broken or eroded? | -- | ||
17 | Check the radiator cooling capacity. is the proper sized radiator being used on the vehicle? | -- | ||
18 | Consult the current parts catalog and replace the radiator. Refer to Radiator Replacement . Is the repair complete? | -- | System OK | -- |
