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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1949 (Engine Cooling System) >> Diagnostic Information and Procedures >> Loss of Coolant (With HP5)

Loss of Coolant (With HP5)

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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. Refer to 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. Refer to Cooling System Draining and Filling (Static Fill With HP5)  or Cooling System Draining and Filling (Static Fill Without HP5)  or Cooling System Draining and Filling (GE 47716 Fill With HP5)  or Cooling System Draining and Filling (GE 47716 Fill Without HP5) .
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 25 
6 Engine overheating can cause a loss of coolant.
Is the engine overheating?		 Go to Step 26  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 28  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
  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 30  Go to Step 10 
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 15  Go to Step 11 
11 Visually inspect the hoses, pipes and hose clamps at the following locations:
  • Coolant recovery reservoir
  • Heater core
  • Radiator

Are any of the hoses, clamps or pipes leaking?		 Go to Step 21  Go to Step 12 
12 Visually inspect the following components:
  • The coolant pressure cap (on the radiator inlet hose)
  • The core plugs
  • The cylinder head gaskets
  • The engine block
  • The intake manifold
  • The radiator
  • The thermostat housing
  • The water pump

Are any of the listed components leaking?		 Go to Step 21  Go to Step 13 
13
  1. Pressure test the cooling system. Refer to 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 21  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 22 
15 Pressure test the coolant pressure cap. Refer to Pressure Cap Testing .
Does the coolant pressure cap hold pressure?		 Go to Step 29  Go to Step 22 
16 Inspect for the following conditions:
  • A coolant smell inside of the vehicle
  • Coolant in the HVAC module drain tube
  • Coolant on the vehicle floor covering near the HVAC module

Is coolant present?		 Go to Step 23  Go to Step 17 
17
  1. Add 30 ml (1 oz) of coolant leak detection dye GM P/N 89022219 (Canadian P/N 89022220) to the cooling system for each 15 L (4 gal) of coolant. Refer to Approximate Fluid Capacities (Except Hybrid) or Approximate Fluid Capacities (Two Mode Hybrid) or Approximate Fluid Capacities (Green Line Hybrid) .
  2. Start the vehicle and allow the engine to reach normal operating temperature.
  3. Shut the engine off.
  4. Use J 42220  Universal 12V Leak Detection Lamp to visually inspect the components listed in steps 11 and 12. See Special Tools .
Are any leaks present?		 Go to Step 21  Go to Step 18 
18 Use J 42220  to inspect for the following conditions:. See Special Tools .
  • Coolant dye in the HVAC module drain tube
  • Coolant dye on the vehicle floor covering near the HVAC module

Is coolant dye present?		 Go to Step 23  Go to Step 19 
19 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 20  Go to Step 21 
20 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 27  Go to Step 21 
21 Repair or replace the leaking component. Refer to the appropriate repair.
Is the repair complete?		 Go to Step 30  -
22 Replace the coolant pressure cap.
Is the repair complete?		 Go to Step 30  -
23 Replace the heater core. Refer to Heater Core Replacement .
Is the repair complete?		 Go to Step 30  -
24 Replace the radiator. Refer to Radiator Replacement (With HP5)  or Radiator Replacement (Without HP5) .
Is the repair complete?		 Go to Step 30  -
25 Repair the engine no crank condition. Refer to Engine Will Not Crank - Crankshaft Will Not Rotate
Is the repair complete?		 Go to Step 30  -
26 Repair the engine overheating condition. Refer to Engine Overheating .
Is the repair complete?		 Go to Step 30  -
27 Repair the engine internal coolant leak. Refer to Coolant in Combustion Chamber
Is the repair complete?		 Go to Step 30  -
28 Repair the engine knock. Refer to Lower Engine Noise, Regardless of Engine Speed
Is the repair complete?		 Go to Step 30  -
29 Repair the combustion pressure in the cooling system problem. Refer to Cylinder Leakage Test
Is the repair complete?		 Go to Step 30  -
30 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2 
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