Heater Problem

Your describing a bad heater core for sure

You will have to hav access to a manual for your specific vehicle. Generally replacing your heater core involves draining your coolant and disconnecting your heater hoses(usually two)-inlet and outlet. These are located under the hood and travel into the cabin of the car. It is common that the glove box is removed to access the core. There are vaccuum lines connected to the heater core as well. It may seem like a lot but with the manual instructions it will guide you thru the job and is pretty straight forward. With warm weather around the corner you may be able to hold off on repair while your a.c. should still work properly. Hope info. is helpful.