Sierra, Silverado 2006-2007
Removal & Installation
Drain the engine cooling system into a clean container for reuse.
Remove or disconnect the following:
Negative battery cable
Heater hoses from the heater core
Temperature control cable from the heater case assembly
Disconnect the mode control cable from the heater case assembly
Instrument panel carrier to provide access to the heater case assembly
Electrical connectors that may interfere with the heater case assembly removal
Heater case assembly-to-chassis screws/nuts and the assembly. Place the heater case assembly on a bench.
Heater core cover screws
Heater core from the heater case
Fig. View of the heater case assembly
Fig. View of the heater core
Install or connect the following:
Heater core to the heater case
Heater core cover screws and tighten to 14 inch lbs. (1.5 Nm)
Heater case assembly and the assembly-to-chassis screws, then, tighten the screws to 35 inch lbs. (4 Nm) and the nuts to 80 inch lbs. (9 Nm)
Electrical connectors, as necessary
Instrument panel carrier
Mode control cable to the heater case assembly
Temperature control cable to the heater case assembly
Heater hoses to the heater core
Negative battery cable.
Refill the engine cooling system.
Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.