From: crwlr@verizon.net   
      
   It needs a ballast resistor.   
      
   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.   
      
   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   
   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.   
      
      
      
      
   "LucifinaMae"  wrote in message news:80478e38cffcc@uwe...   
   >I just bought a '91 toyota pickup and I've discovered that the heater   
   >doesn't   
   > work.  The guy I bought it from told me that there's a problem with the   
   > blower...he said it needed a new heater fan resister, I think?  The blower   
   > works, but only on high, otherwise it stays off. Besides that, it only   
   > blows   
   > cold air.  I've located the heater core and I'm certain that I can change   
   > it   
   > myself if that's what's needed, but I think that it may just be the   
   > thermostat....So basically there's two problems:   
   > 1) The blower isn't functioning properly.  What do I need to fix it?   
   > 2) No hot air comes out when the heater is turned on.  Thermostat problem   
   > or   
   > heater core, and how can I tell which one it is?   
   >   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)