Roadmaster 1992

Drain & Refill

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NOTE
Be sure the engine is COLD before servicing the cooling system. Do not remove the reservoir cap or the radiator cap if the engine is HOT. Serious personal injury may result.

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.


    NOTE
    If working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.


    NOTE
    For vehicles equipped with OnStar (RPO UE1), with battery backup, the backup battery is a redundant power supply to allow limited ONStar functionality in the event of a main battery power disruption to the OnStar module (VCIM). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled by opening the driver-s side door before disconnecting power. Disconnecting power to the module in any way while the ignition is ON or with the retained accessory power activated may cause activation of the OnStar backup battery system and will discharge and permanently damage the backup battery. Once the backup battery is activated it will stay on until it has completely discharged. The backup battery is not rechargeable and once it is activated, it must be replaced.

  2.  
  3. Park the vehicle on a level surface.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Remove the coolant reservoir filler cap. Be sure the engine is cool before removing this cap.
  8.  
  9. Open the radiator drain plug and drain the coolant into an acceptable container. Be sure to properly dispose of used coolant.

    Click image to see an enlarged view

    Fig. Radiator drain plug location

  10.  
  11. Open the heater air bleed valve (1), just above the water pump, on the water pump inlet. Position a shop towel underneath the bleed valve to prevent coolant from splashing on the distributor.
  12.  
  13. Remove both knock sensors.

    Click image to see an enlarged view

    Fig. Knock sensor location



    Click image to see an enlarged view

    Fig. Coolant recovery reservoir location-1991-1993



    Click image to see an enlarged view

    Fig. Coolant recovery reservoir location-1994-1996

  14.  
  15. Allow the cooling system to drain completely.
  16.  

To install:


NOTE
Be sure to use new fasteners, as required.


NOTE
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread sealer are identified. Do not use paints, lubricants or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners.

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Close the radiator drain plug.
  4.  
  5. Install the knock sensors.
  6.  
  7. Tighten the knock sensors to 14 ft. lbs.
    NOTE
    Pure coolant can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent, as the freeze level rises rapidly after this point.

  8.  
  9. Fill the system to the FULL COLD mark, thru the coolant recovery reservoir.
  10.  
  11. When bubbles disappear and only the coolant is visible, close the heater air bleed valve.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Block the wheels. Position the selector lever in PARK or NEUTRAL. Set the parking brake.
  16.  
  17. Run the engine with the recovery reservoir filler cap off, until the thermostat opens.
  18.  
  19. Open the heater air bleed valve.
  20.  
  21. When the bubbles disappear and only the coolant is visible, close the heater air bleed valve. Place a shop towel underneath the bleed valve in order to prevent coolant from splashing on the distributor.
    NOTE
    When filling the cooling system add two engine coolant supplement sealer pellets (part number 3634621) or equivalent.

  22.  
  23. Fill the cooling system thru the coolant recovery reservoir, until the coolant level is about 1 inch above the FULL COLD mark.
  24.  
  25. Install the coolant recovery reservoir filler cap.
    NOTE
    The low coolant warning/indicator light may come on. If after operating the vehicle so that the engine heats up and cools down three times, the low coolant warning/indicator light does not go out, or fails to come on at the ignition check, and the temperature warning/indicator light comes on, immediate action is required. Turn OFF the engine and allow the vehicle to cool. Do not remove the coolant recovery reservoir filler cap at this time.

  26.  
  27. After the engine reaches normal operating temperature check the system for coolant leaks. Correct as required.
  28.  
  29. Test the coolant for proper mixture concentration using tools J23688 and J26568.
  30.  
  31. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.
  32.  

 
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