The first step in replacing the upper Fan Shroud involves loosening the clamps on the air cleaner outlet duct at the
Throttle Body and maf/iat sensor of vehicles with 4.31l, 4.8l, 5.3l or 6.0l engines. Next, remove the air cleaner outlet duct. Losing the clamps on the 8.1l engine duct requires the same process as the other engines before duct removal. The procedure to replace the upper Fan Shroud starts by removing the engine harness clip on the pcm cover and tcm cover bolts followed by lifting the tcm cover to unclip it from the Fan Shroud of vehicles with 6.0l, 6.6l or 8.1l engines equipped with rpo m74 transmission. Disconnect the tcm electrical connectors and take out the tcm unit together with its cover. Before taking out the inlet hose from the Radiator the 4.81l 5.3l or 6.0l engine needs its inlet hose clamp repositioned at the Radiator and its rosebud clips at the Fan Shroud and air cleaner outlet duct removed. Before removing the upper Fan Shroud the technician must first detach the Fan Shroud retainers and bolts. Begin with inserting the upper Fan Shroud into its correct placement, then install Fan Shroud bolts and tighten them to 9 nm (80 inch lbs.) before installing the Fan Shroud retainers. Place the inlet hose on the Radiator while installing the clamp for engines using 4.81l, 5.3l or 6.0l power units. Put the inlet hose rosebud clips on both the Fan Shroud and the air cleaner outlet duct. Reinstallation of the tcm electrical connectors should occur before installing the tcm with its cover. Install the tcm electrical connector bolts to 8 nm (71 inch lbs.) while installing the tcm cover bolts to 9 nm (80 inch lbs.). You should install the air cleaner outlet duct on vehicles with 8.1l engines by using clamps on the Throttle Body and maf/iat sensor to achieve 7 nm of torque (62 inch lbs.). When installing the air cleaner outlet duct on the 4.3l engine keep the hinge clip matched to the Throttle Body lip before lowering the duct until the mounting stud passes through the hole. Complete this step by installing the wingnut to a torque of 3 nm (27 inch lbs.) along with tightening the clamps at the Throttle Body and maf/iat sensor to 7 nm (62 inch lbs.).