It sounds like the heater core is plugged. Remove both radiator hoses and spray water through it to see if the water will flow through.
Let me know what happens.
NOTE: You will lose coolant when you remove them. Make sure the engine is cool and you have something under the vehicle to catch the coolant that is lost. I often times will put locking pliers on both hoses to squeeze them shut and prevent much loss.
Tuesday, October 27th, 2015 AT 5:48 PM