GM 12559575
Thermostat

To service and repair the Thermostat, proceed to remove the air cleaner and the ducts assembly. Drain the coolant partially and then take off the coolant recovery reservoir. Remove the bolts that hold the Thermostat Housing to the Thermostat and unclip the Radiator Hose from the case of the Thermostat Housing so that you may then unveil the Thermostat Housing and the Thermostat itself. Before replacing the Thermostat with a new one, clean the gasket mating surfaces. Next, screw the Thermostat Housing to the Intake Manifold with bolts and tighten them to 25nm (180 inches-1/2 lb.). Reattaching the Radiator Hose onto the Thermostat Housing, replacing the coolant recovery reservoir, and reinstalling the air cleaner and duct assembly. Refill the cooling system and bleed air from it, check the Thermostat Housing and gasket for leaks of coolant.

To carry out service and repair the Thermostat, follow the removal of coolant when the Radiator coolant level is beneath the thermostats. On the 5.7l engine, remove the bolts or studs, coolant outlet, Thermostat from the housing, and gasket if necessary. For the 7.4l, in the same way, demolish the bolts or studs and the coolant outlet, Thermostat from the casing, and if required gasket. Clean the Thermostat housing and the sealing surface of the cooling outlet. For 5.7l install the Thermostat into the housing, the gasket if required, and the coolant outlet, then install the bolts or studs and tighten it to 28 nm (21 ft. Lbs.). For the 7.4l, place the Thermostat into the housing along with any gasket and the coolant outlet, then place the bolts or studs and tighten them to 37 nm (27 ft. Lbs.) nsdictionary. Refill the coolant to the cooling system again and run the engine untill the Radiator upper hose gets hot indicating that the thermostate is open. With the engine idling, fill up the Radiator to the bottom of the filler neck and install the Radiator Cap with the arrows pointing to the overflow tube. Lastly, check for leaks in the cooling system.

Replacing the Thermostat Housing on 4.8l, 5.3l, and 6.0l engines starts by removing the radiator outlet hose followed by taking out the Water Pump inlet bolts to detach the Water Pump inlet and Thermostat while noting the Thermostat's requirement for replacement only as an assembly with the Water Pump inlet. Installation requires placing the Thermostat and Thermostat Housing onto the Water Pump in accordance with service precautions fastener notice. After securing the Thermostat Housing bolts with 15 nm (11 ft. Lbs.) torque, reinstall the radiator outlet hose.

To carry out service and repair the Thermostat, follow the removal of coolant when the Radiator coolant level is beneath the thermostats. On the 5.7l engine, remove the bolts or studs, coolant outlet, Thermostat from the housing, and gasket if necessary. For the 7.4l, in the same way, demolish the bolts or studs and the coolant outlet, Thermostat from the casing, and if required gasket. Clean the Thermostat housing and the sealing surface of the cooling outlet. For 5.7l install the Thermostat into the housing, the gasket if required, and the coolant outlet, then install the bolts or studs and tighten it to 28 nm (21 ft. Lbs.). For the 7.4l, place the Thermostat into the housing along with any gasket and the coolant outlet, then place the bolts or studs and tighten them to 37 nm (27 ft. Lbs.) nsdictionary. Refill the coolant to the cooling system again and run the engine untill the Radiator upper hose gets hot indicating that the thermostate is open. With the engine idling, fill up the Radiator to the bottom of the filler neck and install the Radiator cap with the arrows pointing to the overflow tube. Lastly, check for leaks in the cooling system.

First remove the air cleaner along with the duct assembly followed by draining partial coolant volume before removing the coolant recovery reservoir. Start by disconnecting the Radiator Hose from the Thermostat Housing then remove the bolts that connect the Thermostat Housing to the Thermostat before taking out the Thermostat Housing. Clean up the Thermostat Housing gasket mating places before you remove the Thermostat. Start with Thermostat installation before you connect the Thermostat Housing to the Intake Manifold. With 25 nm applied torque tighten bolts securely into the housing. You must install the Radiator Hose to the Thermostat Housing followed by returning the coolant recovery reservoir and the air cleaner with the duct. Replace the cooling system fluid before checking for air in the lines and assessing the condition of both Thermostat Housing and gasket for leaks.

Initiating a thermostat replacement involves draining the cooling system first. Proceed by relocating the clamp securing the inlet hose to the water outlet before removing that hose from its position. Start by taking off two bolts securing the water outlet then remove both the water outlet and thermostat . Begin setup by setting the thermostat in place followed by installing the water outlet. The fastener notice must be followed during installation while torqueing the water outlet bolts to 30 Nm (22 ft. lbs.). Reinstall the inlet hose to the water outlet before clamping the inlet hose in place at the water outlet. Finally, fill the cooling system.

Remove the two water outlet bolts and take off the water outlet before removing the thermostat.

Remove the two water outlet bolts and take off the water outlet before removing the thermostat.

Install the new thermostat.