Loss of Coolant (LCV, LGX)

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 (Static LCV, LGX) , or Cooling System Draining and Filling (GE 47716 LCV, LGX) . Is the action complete?	Go to Step 5	-
5	Engine overheating can cause a loss of coolant. Is the engine overheating?	Go to Step 19	Go to Step 6
6	Idle the engine at normal operating temperature. 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	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 20	Go to Step 8
8	Visually inspect the hoses, pipes and hose clamps. Are any of the hoses, clamps or pipes leaking?	Go to Step 21	Go to Step 9
9	Visually inspect the following components: Block heater Radiator surge tank cap Core plugs Throttle body Engine block Intake manifold Radiator Thermostat housing Water pump Are any of the listed components leaking?	Go to Step 21	Go to Step 10
10	Pressure test the cooling system. Cooling System Leak Testing With the cooling system pressurized, visually inspect the components listed in steps 7, 8 and 9. Are any leaks present?	Go to Step 21	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 16
12	Inspect for the following conditions: A coolant smell inside of the vehicle Coolant in the heater and air conditioning evaporator and blower module drain tube Coolant on the vehicle floor covering near the heater and air conditioning evaporator and blower module. Is coolant present?	Go to Step 21	Go to Step 13
13	Inspect the underside of the engine oil fill cap for a gray/white milky substance. Is there a milky substance under the oil fill cap?	Go to Step 14	Go to Step 15
14	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 17	Go to Step 15
15	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 18	Go to Step 22
16	Replace the radiator surge tank cap. Is the repair complete?	Go to Step 22	-
17	Replace the radiator. Radiator Replacement (LCV, LGX) Replace the engine oil and oil filter: LCV Engine - Engine Oil and Oil Filter Replacement LGX Enigne - Engine Oil and Oil Filter Replacement Is the repair complete?	Go to Step 22	-
18	Replace the radiator. Radiator Replacement (LCV, LGX) Service the automatic transmission. Engine Coolant/Water in Transmission Is the repair complete?	Go to Step 22	-
19	Repair the engine overheating condition. Engine Overheating Is the repair complete?	Go to Step 22	-
20	Repair the engine internal coolant leak. Coolant in Combustion Chamber , or, Coolant in Engine Oil Is the repair complete?	Go to Step 22	-
21	Repair or replace the leaking component. Is the repair complete?	Go to Step 22	-
22	Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Step 2