Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2009IMPALA V6-3.9LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER BLOCK ASSEMBLYENGINE BLOCK HEATERSERVICE AND REPAIRCOOLANT HEATER REPLACEMENT
2009 Chevrolet Impala V6-3.9L
Coolant Heater Replacement
2009 Chevrolet Impala V6-3.9LSECTION Coolant Heater Replacement
Coolant Heater Replacement (LZE-3.5L Flex Fuel, LZ4-3.5L Gas, LZG-3.9L Flex Fuel)
Removal Procedure
1. Drain the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) (Service and Repair).
2. Disconnect the engine coolant heater cord (2) from the engine coolant heater.
3. Remove the engine coolant heater.
4. Clean the engine coolant heater opening.
Installation Procedure
1. Apply sealer GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the engine coolant heater, if necessary.
Caution: Refer to Fastener Caution (Fastener Caution).
2. Install the engine coolant heater.
Tighten the coolant heater to 60 Nm (44 lb ft).
3. Connect the engine coolant heater cord (2) to the engine coolant heater.
4. Lower the vehicle.
5. Fill the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) (Service and Repair).
6. Inspect for leaks.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.