Service Procedure

1. Replace the auxiliary heater inlet and return hose assembly with the new design auxiliary heater inlet and hose assembly following the procedure found in the 1992 C/K Truck Service Manual X-9231 Page 1A-21.

NOTE:
With a clean drain pan, retain and reuse coolant drained from the system.

2. Loosen the two fasteners which secure the air intake pre-cleaner bracket to the wheel well. They are located inside the passenger side front wheel well.

3. Loosen the single fastener which secures the auxiliary heater pipe assembly to the air intake pre-cleaner bracket.

4. By pulling/pushing/rotating the auxiliary heater pipe assembly, use the relative movement between the loosened components to maximize the distance between the auxiliary rear heater hose assembly and the exhaust manifold.

5. Once the maximum distance is obtained, hold the position and retorque the air intake pre-cleaner bracket fasteners to 18 N-M (159 in.lbs.) and the auxiliary heater pipe assembly fastener to 18 N-M (159 in.lbs.).

6. Using a shop scale, measure the distance between the auxiliary rear heater hose assembly and the passenger side exhaust manifold at their closest point. One half inch (1/2") clearance is a required minimum. If the required minimum is not obtained repeat steps 2 through 6. If minimum clearance is still not obtained the air inlet pre-cleaner bracket and auxiliary heater pipe assembly bracket can be removed and the holes in the wheel well and auxiliary heater pipe assembly bracket can be elongated or enlarged to allow more clearance.

7. Install a "Campaign Identification Label"