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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 641 (Engine Cooling System) >> Repair Instructions >> Water Crossover Replacement (L47) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the cooling system. Refer to Draining and Filling Cooling System .
  2. Remove the air cleaner assembly. .
  3. Remove the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT .
  4. Disconnect the brake booster vacuum tube from the water housing crossover.
  5. Disconnect the fuel regulator vacuum tube (1).
    Fig 1: Disconnecting Fuel Regulator Vacuum Tube
    G01817546Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the secondary AIR solenoid vacuum tube (2).
  7. Remove the throttle body. Refer to THROTTLE BODY .
  8. Disconnect the surge tank inlet hose from the fitting.
  9. Disconnect the fuel rail bracket retaining nut at the rear lift bracket.
    Fig 2: Disconnecting Surge Tank Inlet Hose
    G01817547Courtesy of GENERAL MOTORS CORP.
  10. Remove the surge tank inlet fitting.
  11. Remove the rear lift bracket bolt.
  12. Remove the rear lift bracket.
  13. Remove the EGR valve. Refer to EGR VALVE .
    Fig 3: Removing Rear Lift Bracket
    G01817548Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the EGR inlet pipe nut (1) from the front exhaust manifold pipe.

    Important:  The EGR valve inlet pipe incorporates a crush seal connection at the water crossover. The EGR valve inlet pipe must be replaced if disconnected from the water crossover.

  15. Remove the EGR inlet pipe bolt (2) and flange (3) from the water crossover.
  16. Remove the EGR inlet pipe and discard.
    17. Fig 4: Disconnecting EGR Inlet Pipe
    G01817549Courtesy of GENERAL MOTORS CORP.
  17. Remove the EVAP emission canister purge valve. Refer to EVAP CANISTER PURGE SOLENOID .
  18. Disconnect the electrical connector from the MAP sensor.
  19. Remove the MAP sensor.
    Fig 5: Removing MAP Sensor
    G01817550Courtesy of GENERAL MOTORS CORP.
  20. Position the J 38185 (2)  to the clamp in order to remove the inlet radiator hose (1) from the water housing crossover.
  21. Remove the outlet radiator hose from the thermostat housing.
  22. Remove the water pump. Refer to Water Pump Replacement (LX5)  or Water Pump Replacement (L47)  .
    Fig 6: Removing Outlet Radiator Hose
    G01817551Courtesy of GENERAL MOTORS CORP.
  23. Remove the two bolts (3) attaching the water pump belt tensioner (1) to the water crossover.
  24. Remove the water pump belt tensioner (1).
    Fig 7: Removing Water Pump Belt Tensioner
    G01817552Courtesy of GENERAL MOTORS CORP.
  25. Disconnect the cable harness clip at the water housing crossover and position aside.
  26. Disconnect the heater hose from the water housing crossover.
  27. Remove the water housing crossover from the engine.
  28. Clean and inspect the water crossover. Refer to WATER CROSSOVER CLEANING AND INSPECTION .
    Fig 8: Removing Water Housing Crossover
    G01817553Courtesy of GENERAL MOTORS CORP.
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