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JOHN aka Eauto
JOHN aka Eauto, The Car Guy
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How do I change the thermostat on a 08 Impala LTZ 3.9L V6?

Customer Question

How do I change the thermostat on a '08 Impala LTZ 3.9L V6?
Submitted: 5 years ago.
Category: Chevy
Expert:  JOHN aka Eauto replied 5 years ago.
Hi . Thank you for asking your question on JustAnswer.graphic

  1. Drain the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) ()Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) ()Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill) .
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement .
  3. Reposition the radiator outlet hose clamp at the thermostat housing
  4. Remove the radiator outlet hose from the thermostat housing (3.5L shown, 3.9L similar)graphic


  1. Remove the thermosta housing bolt/stud.
  2. Remove the thermostat housing and gasket.
  3. Remove the thermostat.
  4. Clean the gasket surfaces.
Installation Procedure
  1. Install a NEW thermostat.
  2. Position a NEW gasket and the thermostat housing to the engine block.

Notice: Refer to XXXXX .

  1. Install the thermostat housing bolt/stud.
Tighten the bolt/stud to 10 N.m (89 lb in).
  1. Install the radiator outlet hose to the thermostat housing(3.5L shown, 3.9L similar).
  2. Position the radiator outlet hose clamp at the thermostat housing.
  3. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement .
  4. Fill the cooling system Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill) .
  5. Inspect the system for leaks.


Thank you again for trusting us with your problem. John aka eauto