GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Block Heater

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REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable, then properly drain the engine cooling system.
  2.  
  3. If equipped, remove the engine coolant drain plugs (located at the bottom of the block near the oil pan rail) and drain the coolant from the block. If the engine is not equipped with coolant drain plugs, be ready to catch the coolant that will likely drain from the block when the block heater is removed.
  4.  
  5. Disconnect the block heater electrical connector.
  6.  
  7. Loosen the block heater retaining screw and remove the block heater from the engine.
  8.  

To install:
  1. Coat the block heater O-ring with engine oil and clean the block heater hole of rust.
  2.  
  3. Install the block heater and tighten the retaining screw.
  4.  
  5. Connect the negative battery cable and properly refill the engine cooling system, then check for leaks.
  6.  

 
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