Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system. Refer to Draining and Filling Cooling System .
Loosen the air cleaner outlet duct clamp at the mass airflow/intake air temperature (MAF/IAT) sensor.

Fig 1: Air Cleaner Outlet Duct
Courtesy of GENERAL MOTORS CORP.
Remove the positive crankcase ventilation (PCV) hose.

Fig 2: Remove Positive Crankcase Ventilation (PCV) Hose
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Remove the air cleaner adapter nut.

Fig 3: Remove Air Cleaner Adapter Nut
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In order to remove the air cleaner outlet duct, pivot the duct upward until the hinge clip releases from the lip on the throttle body.

Fig 4: Remove Air Cleaner Outlet Duct
Courtesy of GENERAL MOTORS CORP.
Reposition the inlet hose clamp at the water outlet.
Remove the inlet hose from the water outlet.

Fig 5: Remove Inlet Hose
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Remove the water outlet studs.

Fig 6: Remove Water Outlet Studs
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Remove the water outlet.

Fig 7: Remove Water Outlet
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Remove the thermostat.
Clean the sealing surface of the water outlet.
Clean the sealing surface of the intake manifold.
Remove and discard the O-ring seal.

Fig 8: Remove Thermostat
Courtesy of GENERAL MOTORS CORP.