GM Full-Size Trucks 1988-1998 Repair Information

Heater Water Control Valve

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REMOVAL & INSTALLATION



See Figure 1


CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Drain the cooling system.
  2.  
  3. Loosen the hose clamps at the valve enough to slide the clamps away from the fittings on the valve.
  4.  
  5. Disconnect the hoses and the vacuum line from the valve.
  6.  
  7. Remove the valve.
  8.  
  9. Installation is the reverse of removal.
  10.  



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Fig. Fig. 1: Location of the heater water control and its related components (on models equipped)

 
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