K 1500 Truck 4WD V8-6.0L VIN U (2001)
6.4.
Disconnect the windshield washer supply hose from the bottom of the grille panel.
6.5.
Remove the air inlet grille panel by sliding the panel rearward up the windshield and out.
7.
Just to the left of the right hood hinge, on the horizontal surface of the cowl, locate a cover that is sealed in place. The cover has TRW stamped
into it.
8.
With a sharp knife, cut out the panel following the panel impression in the sealer tape.
9.
Place a lifting device between the cover and the dash. Lift the cover enough to allow another tool to depress and release the front retaining tabs by
pushing rearward on them. Remove the cover.
10.
Look through the opening where you just removed the cover. You will see what looks like a piece of foam about 76 x 127 mm (3 x 5 in). This is
the A/C recirculation door that is within the HVAC module.
11.
Reach into the opening and carefully pull on the air inlet recirculation door. If the recirculation door moves with very little effort, replace the air
inlet (recirculation) door actuator (Manual systems only). For systems with the Automatic Temperature control, initialize the system using
published Service procedures.
12.
Between the top of the HVAC air inlet module (appears as a 6 mm (1/4 inch) black strip) and the cowl sheet metal is a foam seal. This foam seal
may be improperly positioned or damaged in some way (insufficient crush/sealing). This may allow outside ambient air to enter the passenger
compartment incorrectly (under driving conditions). This can be corrected using the following procedure:
Important:
It is imperative that a good seal be achieved over the entire surface areas (no voids or skips), especially around the rear and sides of the HVAC case
to cowl areas.
12.1. Seal the area between the cowl and HVAC case with RTV Silicone Rubber Sealant, P/N 12345739 (in Canada, use P/N 10953541).
12.2. Using your finger, from the engine side of the cowl, ensure that the foam is stuck nicely to the HVAC module and does not have any
distortions.
12.3. From the engine side of the cowl, working through the opening in the horizontal surface of the cowl, place a shop cloth into the opening and
cover the blower fan. This keeps silicone from dripping onto the motor and causing an imbalance condition.
12.4. From the engine side of the cowl, working through the opening in the horizontal surface of the cowl, apply the RTV silicone to bridge the
gap and cover the foam between the cowl sheet metal and the HVAC module case. Inspect your work with a light and a mirror. Ensure that
no gaps or skips are present in the RTV seal.
12.5. Inspect your work for potential drips, runs, etc. If no problem is seen, remove the shop cloth covering the blower motor.
13.
Apply a 3 mm (1/8 in) bead of weatherstrip adhesive, P/N 12345097 (in Canada, use P/N 10953479) around the opening in the horizontal surface
of the cowl, where the cover fits into the cowl.
14.
Place the cover on the workbench, top on the surface, and apply a 3 mm (1/8 in) bead of weatherstrip adhesive on the edge of the cover.
15.
Place the cover into the cowl opening and snap into place.
16.
Apply another bead of weatherstrip adhesive around the joint between the cover and the top of the cowl. Smooth this bead into a smooth surface
with a finger or tool of some kind.
17.
Place the leaf screen to the cowl. Attach the washer supply hose to the bottom of the air inlet grille panel. Do not place the fasteners in at this time.
18.
Install the radio fixed mast antenna. Tighten 1/4 turn after contact is made with the base.
19.
Lower but do not close the hood.
20.
Center the opening in the air inlet grille panel around the antenna mast and then install the air inlet grille panel retaining screws.
Tighten
Tighten the screws to 2 Nm (18 lb in).
21.
Raise the hood.
