You probably need to replace the heater core. Be sure to also check your coolant levels, as well as the condition of the coolant - if it's burned out, have the cooling system flushed and the coolant replaced.
I suggest replacing the thermostat, that might work.
short to ground check bulbs in tail, corrosion can do it
I need a new horn on my 95 town car my want blow loud
Door locks are protected by circuit breakers. A surge of power to a fuse would cause it to blow. They are located in the fuse panel.
Could be the Climate Control Unit or Clogged heater core.
check cooling fan
heater will not blow on a 1996 ford contour
You might need freon
Why does my Lincoln LS V8 Blow cold air on one side and hot air on the other side
Engine coolant leaking into cylinder. Possible bad head gasket.
A possible cause for this is that air suspension pump is continully working due to a leaking air bag
check thermostat, might be stuck closed.