1996 Pontiac Firebird is overheating, and heater will not blow warm air

did you check your radiator to see if it needs to be replaced?
If it is the original my be clogged.
the no heat did you check the flapper door and dash control to see if they are working?

Hi there, have you checked the colour of the oil in the motor, if not clear or normal and have a milky look, it sounds like the head gasket is on the way, it will still drive but the symptoms sound like the head gasket, Check the oil. Hope this will be of some help to solve the problem

are you getting any air into cabin?? cause if you ar getting air but its not coming out hot then it may be a bad heater control valve. If you are not getting any air period then its a bad blower motor or blower motor relay.

White smoke is a sign of burining antifreeze. When heater is not blowing warm air, that is a sign of faulty heater core.
No power, coolant loss, overheating, is sign of headgasket leak.
Double check your thermostat as well.

Are U sure the coolant is full and all the air is out of the cooling system? if the engine was badly overheated then u may have damaged the cylinder head gaskets, this can cause the cold air as well as low coolant..

one of three things can be wrong, your water pump may not be working, if so your car will over heat.. if not, its either jus a disconnected vacuum line or your heater core could be going out

check your radiator coolant, thats what I did and it blows warm again

heater core or leak on cooling system

Okay. warm up vehicle, get radiator hoses hot.  Turn on heater, fan on low.  Grip both rubber heater hoses close to the firewall, from the engine compartment side.  They should be too hot to hold for long.  If they are not hot, then you have a lack of coolant circulation to the heater hoses.  If they are hot then access heater core, behind glove box area.  Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted 

Fan switch could be faulty. If you can look close at the back of the switch, see if it looks like it has been overheated.
Squido