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Remove or Disconnect (Figures 5 through 10 and Figure 20) 1. Battery ground cable. 2. Coolant recovery tank. 3. Heater core hoses (140 and 141) (figures 6, 7, 8 and 20). ^ Place a clean pan under the vehicle to catch any coolant spillage. ^ Plug the hoses. ^ Allow coolant in the core to drain into the pan. 4. Heater distributor duct (134) (figure 9). ^ Remove the screws that hold the distributor duct to the distributor case and the distributor duct to the engine cover. 5. Engine housing cover. Refer to Access Cover, Engine. See: Body and Frame 6. Instrument panel. See: Instrument Panel, Gauges and Warning Indicators 7. Lower the steering column. Refer to Steering Column. See: Steering and Suspension/Steering ^ Raise and support the right side of the instrument panel. 8. Defroster duct (130) to distributor case (124) attaching screws. 9. Distributor to heater case screws. 10. Temperature door cable (145) (figure 10). ^ Fold the cable back for access. 11. Heater case (124) and core (122). ^ Three nuts at the engine compartment side of the distributor case and one screw on the passenger side. ^ Tilt the case assembly rearward at the top while lifting up until the core tubes clear the dash openings. 12. Core retaining straps (123). 13. Core (122). Install or Connect (Figures 5 through 10 and Figure 20) 1. Core (122) to the heater case (124). ^ Apply a bead of permagum sealer between the core and the case. 2. Core retaining straps (123). 3. Heater case (124) to the vehcle. ^ Apply a bead of permagum sealer between the heater case and the opening in the vehicle. ^ Tilt the case until the core tubes clear the cowl opening. 4. 5. 6. 7. 8. 9. Temperature cable (145) to the heater case (124). Distributor duct (134) to the heater case (124). Defroster duct (130) to the heater case (124). Instrument panel. Steering column. Engine housing cover.

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Models: 1988-97 Chevrolet and GMC K Models excluding 1988-93 Models over 8500 # GVW This bulletin is being revised to add information to the Service Procedure, add a new part number, and include schematics. Please discard Corporate Bulletin Number 76-43-01 (Section 4 – Drive Axle). Condition Some owners may comment that the Colder the outside temperature is, the longer it takes for the front axle to engage when 4 wheel drive is selected, or the front axle does not engage. Cause The front axle engagement actuator is a thermally activated component. Because of this characteristic, the time required for the actuator to complete 4 wheel drive engagement is extended as the temperature drops. Correction Replace the front axle actuator and include the applicable wiring harness kit. Refer to the Parts Information in order to determine which wiring harness kit is needed. 1996 model trucks with a build date on or after January 2, 1996 are considered as “961″. If the build date of the truck is unknown, verify the 3 character “axle code” on the front axle label in order to determine which wire harness to order. This new actuator uses a motor to engage the front axle and is not affected by temperature. On 1988-93 models with a GVW rating over 8500$, the new actuator cannot be installed and the thermal actuator will remain the service part