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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1482 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Coolant Bypass Valve Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, 2003 Chevrolet TrailBlazer, and 2002 Oldsmobile Bravada. 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 (BODY VIN CODE 6) or DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 3) 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.
    Fig 1: Removing Heater Inlet Hose From Engine Block
    G01596652Courtesy of GENERAL MOTORS CORP.
    1. Install the J 43181 to the quick connect on the outlet heater core hose (2).
    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. 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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