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either the blower motor is bad or you need to flush out the heater core.due to the age of the vehicle its probably clogged up with deposits and needs to be flushed out with air pressure or you can try hooking up your garden hose to it and flushi9ng it out that way
If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core
Go to any Advance or Autozone Store and buy the Chiltons Manual for your vehicle. They are around 19.99 and this will have every repair that you will ever need to repair anything on your car. I love theses books. They have pictures and step by step instructions. Hope this helps.
I would beleive more that you have build up in the heater core. Try taking loose the heater hoses from the block and use a water hose to spray into one of the hoses letting it come out the other hose then switch hoses with the water hose and keep reverseing for 2/3 times each hose. sounds like stop leak may have been used in a prior time and may be blocking water flow.