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Heater core plugged? Heater core airbound? Thermostat not opening to allow coolant flow?
There really isn't much to it... two coolant hoses go into the firewall, and connect at each end of the heater coil. If you need instructions on how to get to it, you're better off to get a Chilton or Haynes manual.
If the drain plug under the evaporator coil is plugged up it will cause condensation to leak into the car. If the heater core is bad it will allow coolant to leak into the car. If the leak is warm and smells sweet it is the heater coil.
May have a bad heater coil or a lose coolant hose clamp near fire wall.
Sounds like heater core is leaking and needs to be replaced You probably have a leak in the heater coil of the air conditioning system. You can either get the coolant flow to the heater coil shut off (cheapest) and get along without heat in the car, get the heater coil repaired (iffy), or get it replaced (maybe get a used part from an auto salvage yard.
Possible heater coil.
Same way the heater on your truck works... coolant is run through the engine system, becomes heated, is run through a heater coil, and a blower blows the heated air around the heater coil through the ductwork to heat up the vehicle.
The heater core is inside the HVAC housing, under the dash.
it will start leaking from under the dash
Drain coolant, remove anti freeze plug from block (corresponding size to the size of your heater coil plug) and install this plug carefully, using a large nut and a hammer. Refill coolant, let engine idling warm up, check coolant again and the installed heater plug for leaks. Now you can insall the cables, away from any moving or hot parts.
Disconnect the send and return lines to the heater core and connect them together
heater coil is good conductor of electricity