S10/T10 Blazer 4WD V6-173 2.8L VIN B 2-bbl (1983)
Figure 1, 3
Note:
If performing the above procedure does not appear to correct the condition, a gap at the back of the dash, where the dash and cowl assembly
come together with the windshield frame and plenum assembly, may be the cause (see Figure 2). When these two pieces are welded together
in production a gap may be created on the vehicle. After the welding process this gap, as well as the rest of the joint, is sealed. If this gap is
not sealed properly a howl condition can occur. To eliminate this condition the entire joint will have to be resealed. This can be done at the
same time as procedure 1 (see Figure 3).
1)
Using Bowman Distribution black caulking part number 19023 or equivalent it is possible to seal the area where the dash meets the plenum
assembly through the exposed cowl vent windows located on the plenum assembly.
2)
Remove caulking from package and apply through the exposed cowl vent grille. Firmly push the caulking into the area where the dash and
cowl assembly meet the plenum assembly. To insure proper seal it is necessary to install the caulking the full length of the windshield (3.5
