Loss of Coolant (with 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 Charge Air 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 27
	6	Engine overheating can cause a loss of coolant. Is the engine overheating?	Go to Step 28	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 30	Go to Step 8
	8	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 9	Go to Step 10
	9	Coolant in the exhaust system creates a distinctive, burning coolant odor in the exhaust.	Go to Step 29	Go to Step 10

	Step	Action	Yes	No
		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?
	10	Warning: Refer to Moving Parts and Hot Surfaces Warning. With the engine idling, inspect the coolant recovery system. Does the coolant recovery system discharge coolant while the engine is idling?	Go to Step 14	Go to Step 11
	11	Visually inspect the coolant hoses, pipes and hose clamps at the following locations: Charge Air Cooler(s) Engine Radiator(s) Heater Core Radiator Surge Tank Throttle Body Water Pump Are any of the coolant hoses, clamps or pipes leaking?	Go to Step 20	Go to Step 12
	12	Visually inspect the following components: Charge Air Cooler(s) Core Plugs Cylinder Head Gaskets Engine Block Engine Oil Cooler Assembly Engine Radiator(s) Intake manifold Radiator Surge Tank Cap Thermostat Housing Water Pump Are any of the listed components leaking?	Go to Step 20	Go to Step 13
	13	1. Pressure test the cooling system. Cooling System Leak Testing 2. With the cooling system pressurized, visually inspect the components listed in steps 11 and 12. Are any leaks present?	Go to Step 20	Go to Step 14

	Step	Action	Yes	No
	14	Pressure test the radiator surge tank cap. Radiator Surge Tank Cap Testing Does the radiator surge tank cap hold pressure?	Go to Step 15	Go to Step 21
	15	Inspect for the following conditions: A coolant smell inside of the vehicle Coolant in the heater and air conditioning evaporator and blower module removal drain tube Coolant on the vehicle floor covering near the heater and air conditioning evaporator and blower module Is coolant present?	Go to Step 22	Go to Step 16
	16	1. Add 30 ml (1 oz) of coolant system tracer dye to the cooling system for each 15 L (4 gal) of coolant. Adhesives, Fluids, Lubricants, and Sealers Approximate Fluid Capacities 2. Start the vehicle and allow the engine to reach normal operating temperature. 3. Shut the engine off. 4. Use the GE-42220 Universal 12V Leak Detection Lamp to visually inspect the components listed in steps 11 and 12. Are any leaks present?	Go to Step 20	Go to Step 17
	17	Use the GE 42220 Universal 12V Leak Detection Lamp to inspect for the following conditions: Coolant system tracer dye in the heater and air conditioning evaporator and blower module drain tube Coolant system tracer dye on the vehicle floor covering near the heater and air conditioning evaporator and blower module Is coolant dye present?	Go to Step 22	Go to Step 18
	18	Inspect the underside of the engine oil fill cap for a gray/white milky substance. Is a milky substance under the oil fill cap?	Go to Step 19	Go to Step 20
	19	Inspect the engine oil fluid level indicator for a gray/white milky substance.	Go to Step 29	Go to Step 23

	Step	Action	Yes	No
		Is a milky substance on the engine oil fluid level indicator?
	20	Repair or replace the leaking component. Is the repair complete?	Go to Step 31	—
	21	Replace the radiator surge tank cap. Is the repair complete?	Go to Step 31	—
	22	Replace the heater core. Heater Core Replacement Is the repair complete?	Go to Step 31	—
	23	Visually inspect the coolant hoses, pipes and hose clamps at the following locations: Charge Air Cooler Charge Air Cooler Coolant Pump Charge Air Cooling System Hoses Compressor Air Intake Supercharger Engine Radiator Intercooler Heat Exchanger Are any of the hoses, clamps or pipes leaking?	Go to Step 20	Go to Step 24
	24	Visually inspect the following components: Charge Air Cooler Charge Air Cooler Coolant Pump Compressor Air Intake Supercharger Engine Radiator Intercooler Heat Exchanger Are any of the listed components leaking?	Go to Step 20	Go to Step 25
	25	1. Pressure test the charge air cooling system. Charge Air Cooling System Leak Testing 2. With the charge air cooling system pressurized, visually inspect the components listed in steps 23 and 24. Are any leaks present?	Go to Step 20	Go to Step 26
	26	1. Add 30 ml (1 oz) coolant system tracer dye to the cooling system for each 15 L (4 gal) of coolant. Adhesives, Fluids, Lubricants, and Sealers Approximate Fluid Capacities 2. Activate the pump using the MDI to cycle the dye around the charge air cooling system.	Go to Step 20	Go to Step 31

Step	Action	Yes	No
	3. Shut the engine off. 4. Use the GE-42220 Universal 12V Leak Detection Lamp to visually inspect the components listed in steps 23 and 24. Are any leaks present?
27	Repair the engine no crank condition. Engine Will Not Crank - Crankshaft Will Not Rotate Is the repair complete?	Go to Step 31	—
28	Repair the engine overheating condition. Engine Overheating Is the repair complete?	Go to Step 31	—
29	Repair the engine internal coolant leak. Coolant in Engine Oil Coolant in Combustion Chamber Is the repair complete?	Go to Step 31	—
30	Repair the engine knock. Lower Engine Noise, Regardless of Engine Speed Is the repair complete?	Go to Step 31	—
31	Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Step 2