Roadmaster 1992

Removal & Installation

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  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.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the air cleaner assembly.
  6.  
  7. Drain the cooling system to below the thermostat level.
    CAUTION
    When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Properly dispose of used coolant.

  8.  
  9. Disconnect the upper radiator hose from the thermostat housing.
  10.  
  11. Remove the two retaining bolts or studs from the thermostat housing and remove the thermostat. Discard the gasket.

    Click image to see an enlarged view

    Fig. Thermostat and related components-1991-1993

  12.  

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. Use a new gasket when replacing the thermostat.
  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. 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.
  8.  

 
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