From: mik@localnet.com   
      
   "Jeff Strickland"  wrote in message   
   news:jXIwj.33484$T8.17184@trnddc03...   
   > It needs a ballast resistor.   
      
     It doesn't use one.   
      
      
   >   
   > The resistor pack is open in all speed settings except High. It is a common   
   > part that should be available at the parts store down on the corner.   
      
     The blower resistor is not used for high speed.   
      
      
   >   
   > Blowing cold is a sign that the coolant is not circulating through the   
   > heater. Either the plumbing is clogged or the water pump impeller is worn   
      
    If the water pump were bad the truck would overheat.   
      
      
   > out. If the impeller is worn, you should also notice that the truck (engine)   
   > gets hot while stopped in traffic, then cools again when the truck gets   
   > going. My money is on clogged plumbing.   
   >   
   > You can clear the plumbing by disconnecting the heater hoses and connecting   
   > a garden hose to one and turning the hose on. This will flush clear water   
   > through the heater core and hoses. You could, and probably should, flush the   
   > entire cooling system.   
   >   
   >   
   >   
      
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