I have change heater control on the dash (3) times and can not get the heater to change from the vent ( in the face) to defrost or any other control

Vacuum problem or latch may be broken n door.

Some cars incorporate a module in the electronics to control certain operations so get your self a schematic diagram of the electrics and if you find a common point then that will be where the fault is.

Check all vacuum lines that goto the heater control under the right side of the dash.....also check for any connector that are disconnected. Good Luck

International 9400 9200 9900 heat box is under the passages side seat. That where the heater core location and the ac evaporator blower. You have two control motors under there one control the bunk for hot and cold. The other control front for hot and cold. Defrost vent and front vent is in the dash. My suck on defrost and in floor will open to front vent. I have not locate yet.

replace the heater control unit. that should solve it. not the heater core. just the control thats located in your dash under the radio.

The "blender" would refer to the blend actuators that change the flow of air from floor to vent to defrost or combinations. Properly working blend doors will allow you to direct air to the dash vents, the floor, the defroster, the floor and defroster or the floor and dash vents. If it is not working the heater will still work but you will hae no control oer where the air flows.

Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck

the vent door is broke in the heater control box under dash

check under the hood for vacuum leaks this could cause both the heater and the running problem

your flap is controled by engine vacuum and if there is a hose off under the hood you may fix both problems

Pull the AC control in the dash and verify that there is vacuum going to it, all the different air diversion doors are operated by seperate vacuum motors controlled by the ac control head in the dash, as you switch it it sends vacuum to the correct location to work that door for the desired air outlet, dash, floor etc..