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Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the engine coolant. Refer to Draining and Filling Cooling System (LL8) or Draining and Filling Cooling System (LM4) in Engine Cooling.
  2. Remove the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement in Engine Cooling.
  3. Using the J 43181  , disconnect the inlet heater hose from the heater core. See Special Tools and Equipment .
    1. Install the J 43181  to the quick connect on the outlet heater core hose (2). See Special Tools and Equipment .
    2. Close the tool around the inlet heater core hose.
    3. Firmly pull the tool into the quick connect end of the heater hose.
    4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core.
    4. Fig 1: Identifying Hoses
    GM735781Courtesy of GENERAL MOTORS CORP.
  4. Position the hose clamp at the engine outlet using J 38185  .
  5. Remove the heater inlet hose (4) from the engine block.
  6. Remove the nut retaining the coolant bypass valve to the cowl.
  7. Remove the vacuum hose from the coolant bypass valve.
  8. Remove the coolant bypass valve.
  9. Position the clamps at the coolant bypass valve.
  10. Remove the heater inlet hoses form the coolant bypass valve.
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