Blend door for front temp control is stuck in the 'cold' position this winter. Is there a way to manually move and fix the door to get some heat?

If dual heat, most likely the control actuator on the drivers side is bad. If you can get things disconnected enough, you, maybe you can manually push the flapper door to the heat position.

If that works, then you have to find new control or control actuator.

Most of these are vacuum so check vacuum tubes for leaks. I've had mice do a number on such things.

To the wisdom of the auto makers, they have moved to organic rubber in cars. Great food for the vermin

I would check what controls the blend door. The blend door is what changes cold to hot mixtures. It may be stuck, or not working or not receiving power needed to move. Volt meter would be great for thoroughly check this kind of issue and a wiring diagram.

Also check to see if you have a system with a separate controls for drivers side and passenger side. If yes this unit may have failed or whatever controls the blend door. Also the temp sensor may have failed.

Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Sounds like the blend door or blend motor is not functioning/opening. This door allows the heat/cold air to come in by adjusting open, closed or anywhere in-between for temp. Start there. They are usually vacuum controlled and mounted under the front dashboard near the knee board.

blend door or temp contrl switch is bad.

Section 12-02: Heating and Defrosting 1998 Windstar Workshop Manual
REMOVAL AND INSTALLATION Actuator Motors, Electric Temperature Blend Door
Removal

1. Remove cassette storage box or center shelf unit, if equipped.
   

1. Remove instrument panel ash receptacle (04810) by depressing service lever.
   

1. Disconnect electrical harness connector from electric blend door actuator.
   
   
   
   
   

1. Remove three retaining screws.
   
   
   
   
   

1. Carefully pull electric blend door actuator outward and off A/C evaporator housing (19850) assembly.
   

Installation

1. Follow removal procedure in reverse order.
   

1. Air temperature control door shaft is keyed. Move door to properly insert electronic actuator shaft. Make sure the shaft is completely in and properly seated.
   

with truck off, move passenger to full hot and driver's to full cold. turn key on and run air for 15 seconds.

turn key off

move climate controls to opposite positions and turn key on again with air on. Run for 15 seconds. turn key off.

center temp controls and turn key on again. this should fix you.
move

Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.

have 2001 ford windstar front ac blows hot but rear blows cold any idea what problem is and how to fix it?

u will need to repair the passenger side air temp control blend door, either the door is stuck or the small electric actuator that moves it is defective.