Loss of Coolant (without LM2)
Loss of Coolant
| Step | Action | Yes | No | ||
|---|---|---|---|---|---|
| DEFINITION: The cooling system is losing coolant either internally or externally. | |||||
| 1 | Were you sent here from Symptoms, or another diagnostic table? | Go to Step 2 | Go to Symptoms - Engine Cooling | ||
| 2 | Repair any present DTCs. Diagnostic System Check - Vehicle Is the action complete? | Go to Step 3 | — | ||
| 3 | Inspect the coolant level. Is the coolant at the proper level? | Go to Step 5 | Go to Step 4 | ||
| 4 | Fill the cooling system to the proper level. Cooling System Draining and Filling Is the action complete? | Go to Step 5 | — | ||
| 5 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 17 | Go to Step 6 | ||
| 6 | 1. Idle the engine at normal operating temperature. 2. Inspect for heavy white smoke coming out of the exhaust pipe. Is a heavy white smoke present from the exhaust pipe? | Go to Step 7 | Go to Step 8 | ||
| 7 | 1. Coolant in the exhaust system creates a distinctive, burning coolant odor in the exhaust. 2. Condensation in the exhaust system can cause an odorless white smoke during engine warm up. Does the white smoke have a burning coolant type odor? | Go to Step 18 | Go to Step 8 | ||
| 8 | Visually inspect the coolant hoses, clamps, pipes. Are any of the coolant hoses, clamps or pipes leaking? | Go to Step 19 | Go to Step 9 | ||
| 9 | Visually inspect the following components: | Go to Step 19 | Go to Step 10 |
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| Step | Action | Yes | No | ||
|---|---|---|---|---|---|
| Engine Block Engine Block Heater Intake Manifold Radiator Radiator Surge Tank Cap Throttle Body Water Pump Inlet Water Pump Are any of the listed components leaking? | |||||
| 10 | 1. Pressure test the cooling system. Cooling System Leak Testing 2. With the cooling system pressurized, visually inspect the components listed in steps 8 and 9. Are any leaks present? | Go to Step 19 | Go to Step 11 | ||
| 11 | Pressure test the radiator surge tank cap. Radiator Surge Tank Cap Testing Does the radiator surge tank cap hold pressure? | Go to Step 12 | Go to Step 15 | ||
| 12 | Inspect for the following conditions: A coolant smell inside of the vehicle Coolant in the primary or auxiliary heater and air conditioning evaporator and blower module drain Coolant on the vehicle floor covering near the primary or auxiliary heater and air conditioning evaporator and blower module Is coolant present? | Go to Step 19 | Go to Step 13 | ||
| 13 | Inspect the underside of the engine oil filler cap for a gray/white milky substance. Is there a milky substance under the oil filler cap? | Go to Step 14 | Go to Step 20 | ||
| 14 | Inspect the engine oil level indicator for a gray/white milky substance. Is there a milky substance on the engine oil level indicator? | Go to Step 16 | Go to Step 20 | ||
| 15 | Replace the radiator surge tank cap. Is the repair complete? | Go to Step 20 | — | ||
| 16 | 1. Replace the radiator. Radiator Replacement | Go to Step 20 | — |
| Step | Action | Yes | No |
|---|---|---|---|
| 2. Replace the oil and filter. Engine Oil and Oil Filter Replacement Is the repair complete? | |||
| 17 | Repair the engine overheating condition. Engine Overheating Is the repair complete? | Go to Step 20 | — |
| 18 | Repair the engine internal coolant leak. Coolant in Combustion Chamber or, Coolant in Engine Oil Is the repair complete? | Go to Step 20 | — |
| 19 | Repair or replace the leaking component. Is the repair complete? | Go to Step 20 | — |
| 20 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |