Heat problems how do I check the following on my 02 F150, heat control valve, blend door actuator, and how did I fix the problem(s). I believe I have looked at the other possible problems that could cause no heat in my truck. Thermostat - ok, coolant - ok, hoses at heater core - ok. Any other posible fixes?

This vehicle does NOT use a heater control valve. Coolant flows to the heater core at all times. Temperature is regulated by the blend air door and blend door actuator. Locate the blend door. Remove the actuator and open the door by hand. If you get heat, the actuator or the control head is bad. FWIW, the actuator is the most likely cause

02 Ford Explorer Heat Blend Door Actuator Simple Fix - No ...

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Could possibly be a vacuum leak. The blend door actuator controls are usually ran off of vacuum. It is possible that once the engine warms up, even though you have it to heat, the loss of vacuum will cause the blend door to switch positions.

first, check under te hood to see if the heater core water hoses are hot going in and coming out. If hot going in but cold coming out, water valve (if you have one) may not be working.
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Control System Outputs
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by vacuum control motors. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
For more information on the control components Section 412-04 .
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Air Management Doors
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by a vacuum control motor. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
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Section 412-04: Control Components - Climate Control 1997 F-150, F-250 Workshop Manual
REMOVAL AND INSTALLATION A/C Electronic Actuator
Removal

1. Remove the floor duct panel.
   • Remove the two plastic push pins (one each side) and release the expander clip.

1. Remove the RH instrument panel brace.
   1. Remove the lower nut.
   1. Remove the upper bolt.
   1. Remove the brace.

1. Remove the LH instrument panel lower nut and position brace out of the way.

1. Disconnect the vacuum harness from the vacuum actuator.

1. Remove the floor duct.
   1. Remove the two screws (one each side).
   1. Remove the floor duct.

1. Remove the panel/floor door vacuum control motor.
   1. Disconnect the vacuum line connector.
   1. Remove the two panel/floor door vacuum control motor screws.
   1. Slide the rod out of the door and remove the panel/floor door vacuum control motor.

1. Remove the electronic actuator.
   1. Disconnect the electrical connector.
   1. Remove the three screws.
   1. Pull down to release the actuator shaft and remove the electronic actuator.

If you are getting heat only on the pass. side then I believe the blend door has failed. Dodge has a fix and the job is not easy as almost the whole dash needs to come out in order to get to the heater box and the door. I have read that a simple flush of the heater core will cure it, But that diidn't work for me. I think because dual climate control was an option the door is set up to control the two sides of the cab. When it fails only the pass. side gets heat.

Unfortunatly you do have to remove the dash to access any of the blend door or fresh air door actuators
here is a step by step proceedure this takes aprox 5 hrs in a shop so plan on a weekend at home good luck

FLOOR - DEFROST DOOR ACTUATOR

REMOVAL

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

Disconnect and isolate the battery negative cable.
Remove the instrument panel assembly from the vehicle.



Fig. HVAC housing, dual zone shown (single zone similar)-nut (1), passenger blend door actuator (2), nut (3), inlet baffle (4), recirc door actuator (5), recirc air door (6), driver side blend door actuator (7), HVAC housing (8), bolt (9), defroster door actuator (10), mode door actuator (11)

Remove the electrical connector from the actuator.
Remove the mounting screws from the actuator.
Remove the actuator from the HVAC housing.

INSTALLATION
Install the floor-defrost door actuator to the HVAC assembly.
Install the mounting screws and tighten to 2.2 Nm (20 in. lbs.) .
Install the actuator electrical connector.
Install the instrument panel assembly into the vehicle.
Connect the battery negative cable.

I suggest check (or replace if is necessary), the blend door it is a huge project you have to remove the dash board. There is a repair kit available either way it is a 8 hr shop time project.

Hope helps.

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.
   

Check the blend door actuator. The door that the actuator hooks in to tends to break. Visit www.blenddoorfix.com. for more info.

your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.

There are 2 hoses going through the firewall from the engine, these are the coolant hoses to the heater core, one is 3/4" and one 5/8", the control valve should be in the larger line (3/4") which is the inlet, make sure that the valve has vacuum (heater on low), also check and see if both hoses get hot with the heater blower on low, if they do get hot your problem is not the heater control valve but the air temp control blend door actuator.

Confirm an operational thermostat and heat control valve.