Re: 97 Ford Econoline air conditioning and vent settings...
I know from experience that if the coolant is to low ( not just the freon levels in the compresor but the antifreeze/coolant level as well) the AC system will not cool and will blow hot. Check the coolant Antifreeze and freon levels, even with the Coolant being a little low my 1998 Ford E150 Van will blow hot. After you have ruled out of these possibilities and the chance it is the thermostat most likely the problem is what Ford calls the "Flap" it controls the air flow through the vent system when you switch from Heat to AC. When the Flap is working it closes off one systems air flow so as to not interfere with the current climate selection.
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there is a diverter valve that lets hot water from the engine into a heater core, which is a device like a small radiator, which heats the air when it flows past. there is probably a second heater core for the rear. the valve for that one, or the switch or relay to control it is bad.
the vent door on your heating and cooling system probably has a broken vent door which is preventing the cooold air from entering your vehicle its either the control switch for the windows or the window relay for the window motors
The water must be able to circulate and there are three main things to stop this from happening.Heater core blockage,thermostat and water pump.
After checking those you must look at the controls under the dash to see if a dampener door is remaining closed.The doors will shut off the heater core from air circulation when using the air conditioning and vice versa. After starting the van switch the controls for temperature from cold to hot and listen for the door to open and close.That's where I would start.Also you have a Heater Control Valve that shuts off all hot water from entering your heater core.If this valve is closed you would get no to very little heat.It's located in the heater hose from the intake to your heater core.
It sounds like the control motor switching from hot to cold is stuck halfway in between the two temp settings. You will have to take it down and replace it, it is mounted under dash passenger side near the blower motor.
did you cheked if there is enough refrigrant ( freon ) in your tubes by measuring the pressure . if there is you may need to check your condensor its may be clogged and not letting enough air comes through to cool the refrigran
Many auto cooling/heating systems use a "blend door" which mixes both
hot and cold air to provide air at the temperature selected with the
temperature control. When the temp control is in the full cold
position, the blend door moves to a position which allows only cold air
to pass into the cabin/passenger compartment.
That blend door is generally operated with engine primary
[unmodified intake manifold pressure] vacuum. IF there is a leak in the
primary vacuum line system, then at low engine RPM the leak may bleed
off the vacuum necessary to hold the door in the cooling position. Then
when driving, the vacuum will be much higher, "over riding" the leak,
and allow the vacuum motor, which operates the blend door, to hold the
door in the proper position and provide only cold air to the