GM 12596643
Thermostat Housing

The replacement of the Thermostat Housing (LC3) must begin with draining both engine cooling and charge air cooling systems. The supercharger assembly must be removed before you detach the supercharger belt tensioner and the supercharger idler pulley. You must remove the two coolant hoses and the Radiator Hose which connect to the Thermostat Housing. Begin by repositioning the lower bypass hose clamp before removing the bolts that connect the Thermostat Housing to the cylinder heads. Extract the housing with bypass hose, discarding the gaskets at this time. Disassembly of the Thermostat Housing may be required for cleaning followed by an inspection. Assemble the Thermostat Housing as needed and place new gaskets before tightening housing and bypass hose installation onto the vehicle with bolts torqued to 25 nm (18 lb ft). Reset the bypass hose clamp in its proper position before reinstalling both radiator and coolant hoses to the Thermostat Housing. The supercharger idler pulley and supercharger belt tensioner and supercharger assembly must be reinstalled. Add coolant to both the charge air cooling system and engine cooling system before searching for fluid leaks in the systems.

The replacement process for the lc3 - 8 cyl - 4.4l - sc - dohc engine's Thermostat Housing begins with draining engine cooling system liquid using ge 47716 techniques and charge air cooling system liquids. Start by taking away the supercharger assembly then proceed to eliminate the parts which include supercharger belt tensioner and idler pulley. Unplug two coolant hoses and a Radiator Hose from the Thermostat Housing. Use a screwdriver to adjust the bypass hose clamp before using a socket wrench to take away the bolts holding the Thermostat Housing to the cylinder heads and extract everything including the bypass hose while disposing of the gaskets. The Thermostat Housing requires disassembly followed by cleaning for inspection when necessary. Installation requires the assembly of Thermostat Housing when required and the installation of new gaskets followed by attaching housing with bypass hose to the vehicle to be secured with bolts fastened at 25 n.m (18 lb ft). Secure the bypass hose clamp properly before reinstalling both radiator and coolant hoses. Begin by reattaching the supercharger idler pulley and belt tensioner followed by installation of the supercharger assembly. Before completion add coolant to both the charge air cooling system and the engine cooling system while searching for signs of leakage in each system.

Install the thermostat and connect the heater hoses to the heater core.

Install the thermostat and reconnect the heater hoses to the heater core.

Disconnect the heater hoses from the heater core.

Install a new gasket.

Begin by partially draining the cooling system.

Remove the coolant pipe/thermostat housing bolt and the coolant pipe upper bolt.

First, remove the thermostat housing.

Place the new thermostat with a new thermostat seal, and tighten the thermostat bolts to 10 N.m (89 lb in).

Reattach the thermostat housing with the thermostat and seal to the water housing, ensuring to follow the fastener notice.

Reinstall the intake manifold duct clamp and tighten it to 6 N.m (53 lb in).

First, drain the cooling system using Cooling System Draining and Filling (Static Fill) (GE 47716).

Begin by partially draining the cooling system using the appropriate method.

Remove the coolant pipe/thermostat housing bolt and the coolant pipe upper bolt.

Attach the water outlet housing with the bypass hose to the vehicle and secure it with bolts, tightening them to 25 N.m (18 lb ft).

Remove the thermostat housing bolts and take out the thermostat housing along with the thermostat, discarding the seal ring and removing the thermostat from the housing.

Remove the thermostat bolts and the thermostat itself, discarding the thermostat seal.

First, remove the thermostat housing.

Reinstall the air cleaner assembly and fill the cooling system using Cooling System Draining and Filling (GE 47716).

First, drain the cooling system and remove the air outlet duct for access.

Assemble the heater pipes and hoses to the new thermostat housing, install a new gasket, and partially install the thermostat housing bolts to retain the gasket.

Take out the water outlet, discard the old seals, and clean the sealing surfaces of the water outlet housing.

Reconnect the heater hose and radiator hose to the thermostat housing, reinstall the air cleaner outlet duct, and finally fill the cooling system.

Detach the radiator hose and the heater hose from the thermostat housing.

Connect the surge tank outlet pipe to the thermostat.

Tighten it to 6 Nm (53 inch lbs.).

Reconnect the heater hose and radiator hose to the thermostat housing, reinstall the air cleaner outlet duct, and fill the cooling system.

Remove the air cleaner outlet duct, followed by the radiator hose and heater hose from the thermostat housing.

Finally, install the thermostat and reconnect the heater hoses to the heater core.

Discard the seal ring and take out the thermostat from the housing.

Remove the thermostat bolts and the thermostat itself, discarding the thermostat seal.

Carefully take off the thermostat housing along with the heater pipes, hoses, and bolts.

Reinstall the air outlet duct and fill the cooling system.

No, it is important not to separate the upper and lower intake manifolds.