GM 12597257
Thermostat Housing

Disconniecting the heater hoses from the Heater Core, removing the Thermostat and the Thermostat housing bolts are the factors that help in using the engine coolant Thermostat housing (LY7). Subsequently, remove the Thermostat housing, heater pipes, hoses, and bolts, and clear the sealing faces with help of a plastic gasket scraper (J 28410 or its kind). For the assembly, install the heater pipes and hoses to the Thermostat housing, and install a new gasket onto the Thermostat housing. Partially install the Thermostat housing bolts to hold the gasket before inserting the Thermostat housing with the heater pipes, hoses, gasket, and bolts. Make sure to finger tighten the Thermostat housing bolts to 20 n.m (15 lb ft) and then install the Thermostat. Lastly, reconnect heater hoses with the heater cores.

Start the Thermostat (LY7) replacement by partially draining the cooling system without separating upper and lower intake manifolds. First disconnect both the upper and lower intake manifolds before separating the surge tank hose from the Thermostat location. The replacement of the Thermostat (LY7) starts with removing the coolant pipe/Thermostat housing bolt, then the coolant pipe bolt followed by separating the coolant inlet pipe from the Thermostat housing. Remove the coolant pipe o-ring seal and Thermostat seal when performing the Thermostat bolt removal and Thermostat removal process. Before installing the Thermostat place it with a new Thermostat seal then use a torque wrench to tighten the bolts to 10 n.m (89 lb in). Installation of the new coolant pipe seal follows after it is reattached with the fasteners 1 & 3 before reconnecting the surge tank hose to the Thermostat and lastly reinstalling upper and lower intake manifolds to complete the cooling system's refill.

To replace the Thermostat Housing (LY7), one should start disconnecting the heater hoses from the heater core, then remove the Thermostat as well as the Thermostat Housing bolts. Next, disconnect the Thermostat Housing as well as the heater pipes, hoses, and bolts, and clean the sealing surfaces with a plastic gasket scraper (J 28410 or equivalent) very carefully. Unto installation, assemble the heater pipes and hoses to Thermostat Housing, then put on a new gasket into the Thermostat Housing. Monte the Thermostat Housing bolts partially to hold the gasket in place before installing the Thermostat Housing with the heater pipes, hoses, gasket, and bolts. Make sure to install the Thermostat Housing bolts and tighten them to 20 nm (15 ft. Lbs.). Last, install the Thermostat and reconnect the heater hoses to the heater core.

To replace the Thermostat Housing (RPO LX9), the work should start by removing the air cleaner outlet duct and cooling system partially drained. Next, move the radiator inlet hose clamp from the Thermostat Housing, anddetach the radiator inlet hose from Thermostat Housing. Remove the Thermostat Housing, then the bolts holding the Thermostat Housing. For installation, install the Thermostat Housing by ensuring that he follows the fastener notice in service precautions. Make sure to secure the Thermostat Housing bolts with 25 nm (18 ft. Lbs.), and the radiator inlet hose clamp with reattaching the radiator inlet hose to the Thermostat Housing. Finally, install the air cleaner outlet duct and top up the cooling system.

Remove the thermostat housing bolts, ensuring to clean any sealer from the bolt threads.

Reinstall the coolant pipe with a new seal and the fasteners, then reconnect the surge tank hose to the thermostat.

Reinstall the upper intake manifold with the lower intake manifold.

Drain the coolant until the level is below the thermostat.

Reinstall the thermostat housing.

Assemble the heater pipes and hoses to the thermostat housing, then install a new gasket.