My heat or my air doesn't work in my 1995 Pontiac Bonneville but it blows good. What could be the issue?

Make sure coolant level is full. your heater core feeds off the top of the radiator so if the coolant is low you will not get heat. If coolant is full then check your heater hoses coming out from the fire wall (where connect to heater core). if both hoses are hot then the door on your air box may be stuck. look under passenger side dash should be able to see the air box. there will be a rod somewhere on the box that you can try to move manually. If one hose is hot and the other is cold then your heater core is clogged and will need to be replaced.

My 2004 pontaic bonneville the heater hoses going into and out from the heater core are hot , but the heater blow cold air. ,