Support, Baffles, & Deflectors Information

RADIATOR CORE SUPOORT - C/K Models

On models equipped with the 7.4L engine, verify that the radiator core support has the correct opening dimensions. See GMC Truck service bulletin # 88-T-143 (Corporate Number 866205).

Figure 4:

Figure 5:

BAFFLES AND DEFLECTORS - C/K Models

On models equipped with the 7.4L engine, verify that the lower radiator support baffle has been installed (Figure 4). For additional information see GMC Truck service bulletin # 88-T-143 (Corporate Number 866205). Also verify that the upper radiator air deflector has been installed (Figure 4).

On models equipped with the 5.7L engine, verify that the front bumper air deflector has been installed (Figure 5).

Figure 6:

Figure 7:

BAFFLES, DEFLECTORS, PANELS and SEALS - R/V models

On R/V models equipped with the 7.4L engine, verify that the radiator baffle has been installed (Figure 6). Also verify that the upper radiator panel has been installed (Figure 7).

Figure 8:

Figure 9:

On R/V models equipped with the 5.7L engine, verify that the front bumper air deflector has been installed (Figure 8). On models with air conditioning, verify that both left and right radiator seals have been installed (Figure 9).

AFTERMARKET ACCESSORIES

Verify that there are no aftermarket transmission oil coolers or other aftermarket accessories mounted in front of the radiator or condenser. Accessories mounted in this area reduce or alter air flow required for proper cooling. Relocate all such aftermarket accessories to an area where air flow to the radiator or condenser will not be affected.