Sierra 2500 4WD V8-6.6L DSL Turbo (2007)
7. Disconnect the engine wiring harness electrical connector (1) from the intake air heater (IAH).
8. Disconnect the engine wiring harness electrical connector (2) from the manifold absolute pressure (MAP) sensor.
9. Reposition the engine wiring harness branches out of the way.
10. Open the IAH harness lead cover (2).
11. Remove the engine wiring harness lead nut (1) from the IAH stud.
12. Remove the engine wiring harness lead (3) from the IAH stud.
