Step | Action | Yes | No | ||||||||||||||||
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DEFINITION: The cooling system is loosing 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 in Engine Cooling | ||||||||||||||||
2 | Repair any present DTCs. Refer to Diagnostic System Check - Engine Cooling . Is the action complete? | Go to Step 3 | -- | ||||||||||||||||
3 | Inspect the coolant level. Is the coolant at the proper level? | Go to Step 6 | Go to Step 4 | ||||||||||||||||
4 | Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling . Is the action complete? | Go to Step 5 | -- | ||||||||||||||||
5 | If the engine is suspected to have a coolant leak into a cylinder, the coolant can hydraulically lock the engine. Does the engine crankshaft rotate? | Go to Step 6 | Go to Step 28 | ||||||||||||||||
6 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 29 | Go to Step 7 | ||||||||||||||||
7 | Extended operation with a low coolant level can cause engine internal component failure. Is the engine knocking? | Go to Step 31 | Go to Step 8 | ||||||||||||||||
8 |
Is a heavy white smoke present from the exhaust pipe? | Go to Step 9 | Go to Step 10 | ||||||||||||||||
9 | Coolant in the exhaust system creates a distinctive, burning coolant odor in the exhaust. 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 30 | Go to Step 10 | ||||||||||||||||
10 | With the engine idling, inspect the coolant recovery reservoir system. Does the coolant recovery system discharge coolant while the engine is idling? | Go to Step 15 | Go to Step 11 | ||||||||||||||||
11 | Visually inspect the hoses, pipes and hose clamps at the following locations:
Are any of the hoses, clamps or pipes leaking? | Go to Step 20 | Go to Step 12 | ||||||||||||||||
12 | Visually inspect the following components:
Are any of the listed components leaking? | Go to Step 20 | Go to Step 13 | ||||||||||||||||
13 |
Are any leaks present? | Go to Step 20 | Go to Step 14 | ||||||||||||||||
14 | Pressure test the coolant pressure cap. Refer to Pressure Cap Testing . Does the coolant pressure cap hold pressure? | Go to Step 16 | Go to Step 21 | ||||||||||||||||
15 | Pressure test the coolant pressure cap. Refer to Pressure Cap Testing . Does the coolant pressure cap hold pressure? | Go to Step 32 | Go to Step 21 | ||||||||||||||||
16 | Inspect for the following conditions:
Is coolant present? | Go to Step 22 | Go to Step 17 | ||||||||||||||||
17 | Inspect the underside of the engine oil fill cap for a gray/white milky substance. Is there a milky substance on under the oil fill cap? | Go to Step 18 | Go to Step 19 | ||||||||||||||||
18 | Inspect the engine oil fluid level indicator for a gray/white milky substance. Is there a milky substance on the engine oil fluid level indicator? | Go to Step 23 | Go to Step 19 | ||||||||||||||||
19 | Inspect the automatic transmission oil fluid level indicator, if equipped, for a gray/white milky substance. Is there a milky substance on the automatic transmission fluid level indicator? | Go to Step 25 | Go to Step 33 | ||||||||||||||||
20 | Repair or replace the leaking component. Refer to the appropriate repair. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
21 | Replace the coolant pressure cap. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
22 | Replace the heater core. Refer to Heater Core Replacement in Heating, Ventilation and Air Conditioning. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
23 |
Is coolant present? | Go to Step 24 | Go to Step 27 | ||||||||||||||||
24 |
Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
25 |
Is coolant present? | Go to Step 26 | Go to Step 27 | ||||||||||||||||
26 |
Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
27 | Install the cooler lines to the radiator. Is the action complete? | Go to Step 33 | -- | ||||||||||||||||
28 | Repair the engine no crank condition. Refer to Engine Will Not Crank - Crankshaft Will Not Rotate 2.2L or Engine Will Not Crank - Crankshaft Will Not Rotate in Engine Mechanical 4.3L. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
29 | Repair the engine overheating condition. Refer to Engine Overheating . Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
30 | Repair the engine internal coolant leak. Refer to Coolant in Combustion Chamber 2.2L or Coolant in Combustion Chamber 4.3L or Coolant in Engine Oil 2.2L or Coolant in Engine Oil in Engine Mechanical 4.3L. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
31 | Repair the engine knock. Refer to Lower Engine Noise, Regardless of Engine Speed 2.2L or Lower Engine Noise, Regardless of Engine Speed in Engine Mechanical 4.3L. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
32 | Repair the combustion pressure in the cooling system problem. Refer to Cylinder Leakage Test 2.2L or Cylinder Leakage Test in Engine Mechanical 4.3L. Is the repair complete? | Go to Step 33 | -- | ||||||||||||||||
33 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |