Heater Bypass Update Instructions

Figure 1:

7.3LD And 7.5L Applications

1. Inspect the vehicle to determine if the heater bypass system requires updating. Refer to the appropriate illustration (Figures 1 - 4) which shows proper heater bypass hose routing. If the update is required continue with Step 2.

2. Drain the engine coolant.

3. Remove both heater hoses and the heater bypass tube assembly.