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Home >> Chevrolet >> 2007 >> Impala V6-3.5L >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Thermostat >> Service and Repair
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Thermostat: Service and Repair



Thermostat Replacement (RPOs LZE, LZ4, LZ8)

Removal Procedure




1. Drain the cooling system. Refer to Draining and Filling Cooling System (9C1, 9C3 Static Fill) Draining and Filling Cooling System (LS4 GE 47716 Fill) Draining and Filling Cooling System (LS4 Static Fill) Draining and Filling Cooling System (LZE, LZ4, LZ8, 9C1, 9C3, GE47716 Fill) Draining and Filling Cooling System (LZE, LZ4, LZ8 Static Fill).
2. Remove the air cleaner outlet duct.
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).




5. Remove the thermostat housing bolt/stud.
6. Remove the thermostat housing and gasket.
7. Remove the thermostat.
8. 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 Fastener Notice.

3. Install the thermostat housing bolt/stud.

Tighten the bolt/stud to 25 N.m (18 lb ft).




4. Install the radiator outlet hose to the thermostat housing (3.5L shown, 3.9L similar).
5. Position the radiator outlet hose clamp at the thermostat housing.
6. Install the air cleaner outlet duct.
7. Fill the cooling system. Refer to Draining and Filling Cooling System (9C1, 9C3 Static Fill) Draining and Filling Cooling System (LS4 GE 47716 Fill) Draining and Filling Cooling System (LS4 Static Fill) Draining and Filling Cooling System (LZE, LZ4, LZ8, 9C1, 9C3, GE47716 Fill) Draining and Filling Cooling System (LZE, LZ4, LZ8 Static Fill).
8. Inspect the system for leaks.

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