GM 12632948
Thermostat

The Thermostat installation requires waiting for engine temperature to drop before proceeding with coolant draining until the Thermostat level is reached. Begin the replacement process by removing the air cleaner assembly and disconnecting the ground lead from the coolant outlet and taking out all bolts including the bolt/stud before you can safely remove the coolant outlet. Clean all sealing surfaces and parts before moving on to the next step. Thermostat installation begins with repositioning the cooling outlet component followed by the Thermostat. Reinstall the bolt alongside the bolt/stud before tightening both pieces to 25 nm (18 ft. Lbs.) and reconnected the ground lead to the bolt/stud. You should replace the air cleaner assembly afterwards and add coolant before starting the engine. Monitor for any leakage when the engine reaches its normal operating temperature.

The replacement process for the 4.3l engine Thermostat begins when you drain part of the cooling system. Start by removing the outlet duct from the air cleaner before unscrewing all throttle body bracket nuts to relocate the bracket. The procedure starts by discarding the lower Intake Manifold water outlet housing mounting bolts before separating this housing from the manifold to set it safely aside. First clean both sealing surfaces of the water outlet housing and lower Intake Manifold before you put the new gasket or o-ring and Thermostat into place. All installation parts require complete cleaning to avoid leakage between sealing surfaces. Attach the Thermostat with either a new gasket or o-ring before connecting the water outlet housing to the lower Intake Manifold using the directions in fastener notice in service precautions. Fasten water outlet housing mounting bolts to 19 nm (14 ft. Lbs.) before reattaching the throttle body bracket which requires bracket nuts to be tightened to 10 nm (89 inch lbs.). Before you finish you must fill the cooling system while inspecting it for leakages.

First you need to uninstall the air cleaner and duct assembly before parially draining coolant from the system and removing the coolant recovery reservoir. Starting with the Radiator Hose separation from the Thermostat Housing proceed to remove Thermostat Housing bolts followed by removing both components. First clean the mounting areas for the gaskets before you add a new Thermostat. Fasten the Thermostat Housing to the Intake Manifold before tightening its bolts to 25 nm (18 ft. Lbs.). Reinstall the coolant recovery reservoir and therapist housing Radiator Hose before you return the air cleaner and duct. To complete the procedure you should fill the cooling system then extract air from it before examining the Thermostat Housing and its gasket for coolant leakage.

First you need to uninstall the air cleaner and duct assembly before parially draining coolant from the system and removing the coolant recovery reservoir. Starting with the Radiator Hose separation from the Thermostat Housing proceed to remove Thermostat Housing bolts followed by removing both components. First clean the mounting areas for the gaskets before you add a new Thermostat. Fasten the Thermostat Housing to the Intake Manifold before tightening its bolts to 25 nm (18 ft. Lbs.). Reinstall the coolant recovery reservoir and therapist housing Radiator Hose before you return the air cleaner and duct. To complete the procedure you should fill the cooling system then extract air from it before examining the Thermostat Housing and its gasket for coolant leakage.

To service the Thermostat, you should make sure the engine is cool not to lick to avoid burns, then drain the coolant unpulsion to a level below the Thermostat. Drop the air cleaner assembly, unplug the ground lead from the outlet of the coolant, remove the bolt/stud and the bolt on the outlet of the coolant to remove the coolant outlet and the Thermostat. Clean all its parts and sealing surfaces properly. For installation, put the Thermostat back in place followed by the coolant outlet. Mount the bolt and bolt/stud and torque to 25 nm (18 ft. Lbs.) and reconnect the ground lead to the bolt/stud. Replace the air cleaner assembly and fill in the coolant. Finally, run the engine and monitor for leaks once it has heated up to normal operating temperature.

A 4.3 l engine Thermostat replacement begins with draining part of the cooling system. Begin by removing the air cleaner outlet duct before you unscrew throttle body bracket nuts to shift the bracket into position. Detach the water outlet housing from the lower Intake Manifold while removing its mounting bolts. Place the water outlet housing aside for now. Bring out the Thermostat along with gasket or o-ring before you clean all joining surfaces between the water outlet housing and lower Intake Manifold. Inspect all components and sealing areas before putting them together in order to block leaks between parts. Put the Thermostat and a new gasket or o-ring into position before installing the water outlet housing onto the lower Intake Manifold while following the fastener notice in service precautions. Mount the water outlet housing bolts securely at 19 nm torque setting (14 ft. Lbs.) before reattaching the throttle body bracket using nuts tightened to 10 nm (89 inch lbs.). Complete the cooling system fluid operation and conduct a check for all leakages.

The replacement process for the 4.3l engine Thermostat begins when you drain part of the cooling system. Start by removing the outlet duct from the air cleaner before unscrewing all throttle body bracket nuts to relocate the bracket. The procedure starts by discarding the lower Intake Manifold water outlet housing mounting bolts before separating this housing from the manifold to set it safely aside. First clean both sealing surfaces of the water outlet housing and lower Intake Manifold before you put the new gasket or o-ring and Thermostat into place. All installation parts require complete cleaning to avoid leakage between sealing surfaces. Attach the Thermostat with either a new gasket or o-ring before connecting the water outlet housing to the lower Intake Manifold using the directions in fastener notice in service precautions. Fasten water outlet housing mounting bolts to 19 nm (14 ft. Lbs.) before reattaching the throttle body bracket which requires bracket nuts to be tightened to 10 nm (89 inch lbs.). Before you finish you must fill the cooling system while inspecting it for leakages.

Begin by partially draining the cooling system.

Refill the cooling system, bleed the air from it, and inspect the thermostat housing and gasket for any coolant leaks.

Begin by removing the air cleaner and duct assembly.

Remove the bolts or studs, coolant outlet, thermostat from the housing, and gasket if needed.

Reconnect the radiator hose to the thermostat housing.

Place a NEW O-ring seal onto the thermostat and install it, followed by the water outlet.

Install the water outlet studs and tighten them to 25 Nm (18 ft. lbs.).

Reinstall the throttle body bracket and its nuts, tightening them to 10 Nm (89 inch lbs.).

Align the hinge clip with the throttle body lip and pivot the air cleaner outlet duct downward until the mounting stud is through the hole, then install the air cleaner adapter nut and the PCV hose.

First, remove the thermostat housing using the Engine Coolant Thermostat Housing Replacement (LY2, LH6, LY5, LMG, LY6) procedure.

Install the thermostat along with a new gasket or O-ring.

Refill the coolant to the cooling system, start the engine, and run it with the radiator cap removed until the radiator upper hose becomes hot, indicating that the thermostat is open.

Remove the necessary coolant from the radiator.

Ensure the engine is cool to avoid burns.

Remove the thermostat and clean all parts and sealing surfaces.

Remove the water outlet studs and the water outlet itself, followed by the thermostat.

Start by installing the thermostat.

Fill the cooling system and inspect for leaks.

Remove and discard the O-ring seal.

Reinstall the thermostat housing.