Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

Removal & Installation

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CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Drain the cooling system.
  2.  
  3. Remove the access panel nut near the pollen filter.
  4.  
  5. Remove the access panel.
  6.  
  7. Remove the following components from the hot water flow control valve:
    1. The vacuum hose
    2.  
    3. The remaining hose clamps
    4.  
    5. The remaining hoses
    6.  

  8.  
  9. Remove the hot water flow control valve.

    Click image to see an enlarged view

    Fig. Heater water control valve

  10.  

To install:

  1. Install the hot water flow control valve.
  2.  
  3. Install the following hot water flow control valve components:
    1. The hoses
    2.  
    3. The hose clamps
    4.  
    5. The vacuum hose
    6.  

  4.  
  5. Install the access panel.
  6.  
  7. Install the access panel nut until fully seated and not stripped.
  8.  
  9. Fill the cooling system.
  10.  

  1. Drain the cooling system.
  2.  
  3. Remove the access panel nut near the pollen filter.
  4.  
  5. Remove the access panel.
  6.  
  7. Remove the following components from the hot water flow control valve:

    The vacuum hose
     
    The remaining hose clamps
     
    The remaining hoses
     

  8.  
  9. Remove the hot water flow control valve.

    Click image to see an enlarged view

    Fig. Heater water control valve

  10.  

To install:

  1. Install the hot water flow control valve.
  2.  
  3. Install the following hot water flow control valve components:

    The hoses
     
    The hose clamps
     
    The vacuum hose
     

  4.  
  5. Install the access panel.
  6.  
  7. Install the access panel nut until fully seated and not stripped.
  8.  
  9. Fill the cooling system.
  10.  

 
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