Avalanche, Express, Savana 2006-2007

Removal & Installation

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  1. Drain the engine cooling system into a clean container for reuse.
  2.  
  3. 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

    Click image to see an enlarged view

    Fig. View of the heater case assembly



    Click image to see an enlarged view

    Fig. View of the heater core

     

  4.  

To install:

  1. 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.
     

  2.  
  3. Refill the engine cooling system.
  4.  
  5. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  6.  

  1. Drain the engine cooling system into a clean container for reuse.
  2.  
  3. Discharge and recover the air conditioning system refrigerant.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Heater hoses from the heater core
     
    Positive battery cable, the battery hold-down and the battery
     
    Refrigeration lines from the air conditioning accumulator and discard the gaskets
     
    Air conditioning accumulator
     
    Lower right kick panel and the knee bolster, from the right side
     
    Lower outer floor air outlet duct
     
    Heater case screws
     

  6.  
  7. Carefully open the heater core access door.

    Heater core-to-heater case retainers and the heater core

    Click image to see an enlarged view

    Fig. Under hood view of the heater assembly-Express and Savana



    Click image to see an enlarged view

    Fig. View of the heater case screws-Express and Savana



    Click image to see an enlarged view

    Fig. View of the heater core and retainers-Express and Savana

     

  8.  

To install:

  1. Install or connect the following:

    Heater core and the heater core-to-heater case retainers. Carefully, close the heater core access door.
     
    Heater case screws
     
    Lower outer floor air outlet duct
     
    Knee bolster and the lower right kick panel
     
    Air conditioning accumulator.
     
    Refrigeration lines to the air conditioning accumulator, using new gaskets
     
    Battery, the battery hold-down and the positive battery cable
     
    Heater hoses to the heater core
     

  2.  
  3. Evacuate and charge the air conditioning system.
  4.  
  5. Refill the engine cooling system.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  10.  

 
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