GM 12620112
Thermostat Housing

The first step for water outlet housing replacement requires disconnecting the radiator inlet hose from its position on the housing. After removing the power steering pump bracket you should take out the water outlet housing bolts. Detach the water outlet housing along with its seal and dispose of the removed original seal. Before installation check both the engine Cylinder Head sealing surface and the water outlet housing for burrs and foreign material. Replace the water outlet housing together with a new seal following the fastener notice. Fasten the water outlet housing bolts using a torque setting of 10 n.m (89 lb in). To finish the installation connect the radiator inlet hose to the water outlet housing while placing the power steering pump bracket back in place.

Start your engine coolant Thermostat replacement project on a 4.2l engine by obtaining these basic tools: hose clamp pliers (J 38185). Hose clamp pliers (J 38185). Start your process by draining coolant from the Radiator. Next, remove the generator. First remove the outlet hose clamp from the Thermostat Housing before you disconnect the outlet hose. Next remove the Thermostat Housing bolts before extracting the Thermostat Housing from its position on the engine block. First wipe down everything inside the Thermostat Housing before cleaning the contacting area where the engine block meets the housing. Position the Thermostat Housing on the engine block before screwing in Thermostat Housing bolts until they reach 10 n.m (89 lb in). The Radiator Hose's inner diameter needs lubrication with engine coolant before re-attaching the outlet hose to the Thermostat Housing through its clamp installation. Replace the generator then fill the cooling system according to coolant specifications. After starting the engine the technician should inspect all areas with sealing surfaces for possible leaks.

Begin water outlet housing replacement by separating the radiator inlet hose from the housing. First separate the power steering pump bracket then remove the water outlet housing bolts. Use proper caution to remove the water outlet housing with its seal before you discard the old sealing part. A thorough inspection for burrs and foreign particles must occur on both the engine Cylinder Head's sealing surface and the water outlet housing before installation begins. Include a new seal with your water outlet housing during installation and tighten all housing bolts to 10 n.m (89 lb in). Attach the power steering pump bracket and use the radiator inlet hose to join with the water outlet housing.

The first step for water outlet housing replacement requires disconnecting the radiator inlet hose from its position on the housing. After removing the power steering pump bracket you should take out the water outlet housing bolts. Detach the water outlet housing along with its seal and dispose of the removed original seal. Before installation check both the engine Cylinder Head sealing surface and the water outlet housing for burrs and foreign material. Replace the water outlet housing together with a new seal following the fastener notice. Fasten the water outlet housing bolts using a torque setting of 10 n.m (89 lb in). To finish the installation connect the radiator inlet hose to the water outlet housing while placing the power steering pump bracket back in place.

To replace the Thermostat of 4.2 engine first extract needed coolant from the Radiator and after that extract the generator. It can be done using the hose clamp pliers (J 38185) to loosen the outlet hose clamp at the Thermostat Housing and getting the outlet hose out. Then, unfasten the bolts of the Thermostat Housing and unfasten the housing from the engine block. Clean all Thermostat Housing panels and sealing surface of engine block. Lock the temperature sender into place in the Thermostat Housing while gripping the housing, without working on the water inlet to the engine block, following the fastener notice as required for a correct fix. Tighten the Thermostat Housing bolts, until it reaches 10 nm (89 inch lbs.). Apply engine coolant to lubricate the inner diameter of the Radiator hose and slide the outlet hose onto the Thermostat Housing and tighten it using the clamp. Uninstall the generator, refill the cooling system with the given coolant and concentration, and last, check all sealing for leakage after starting the engine.

Clean all surfaces of the thermostat housing and the sealing surface of the engine block.

Clean all surfaces of the thermostat housing and the sealing surface of the engine block.

Use J 38185 (Hose Clamp Pliers) as a special tool.

Use the J 38185 Hose Clamp Pliers.

Inspect all sealing surfaces for leaks.

Finally, reinstall the radiator outlet hose.

Use the Hose Clamp Pliers (J 38185) to loosen the outlet hose clamp at the water inlet of the thermostat.