Question about 2006 Ford F 350 Super Duty

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Defrost Where's the module to control the doors in the heater box

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Is your moter working the fan that bring in the heat. check the hoses that they are not diconected

Posted on May 01, 2013

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Posted on Jan 02, 2017

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SOURCE: 2004 expedition heat comes out at defrost only, no matter where I set it.

This is normally a vacuum issue. You need to check the vacuum lines coming into the truck. They are running along the firewall right under the cowell. These usually get a hole in them right in the middle and sometimes they get pulled off by accident. If you can not find a leak there, your switch may be bad. It is all vacuum operated.

Posted on Feb 06, 2012

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Looking for a diagram of heater control valve vacuum lines on a 2003 GMC Envoy with a 5.3 engine


There are no vacuum lines for the HVAC , electroniclly controlled .

Mode Actuator
The mode actuator is an electronic stepper motor with feedback potentiometers. The HVAC control module sends signals to the mode door actuator through the mode door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the mode actuator. When you select a desired mode setting, logic determines the value of the mode actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the mode door position signal circuit. The motor moves the mode door to the desired position.

Defrost Actuator
The defrost actuator operates the same as the mode actuator. The HVAC control module sends signals to the mode door actuator through the defrost door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the defrost actuator. When you select a defrost setting, logic determines the value of the defrost actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the defrost door position signal circuit. The motor moves the defrost door to the desired position.

Feb 24, 2017 | GMC Cars & Trucks

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My heater is stuck on the windshield and floor what actuator needs to be changed


Air Distribution
The HVAC control module controls the distribution of air by the use of a defrost actuator and a mode actuator. The modes that may be selected are:
?€¢
Defrost


?€¢
Defog


?€¢
Panel


?€¢
Bi-Level


?€¢
Floor

The mode and defrost actuators are connected to the mode and defrost doors by a cam type linkage system. Depending on the position of the door, air is directed through the HVAC module and distributed through various ducts leading to the outlets in the dash. If the HVAC control module detects a fault with the mode or defrost doors the HVAC control module will try to drive the actuator for a predetermined amount of time, to defrost, which is the defaulted position for the mode and defrost door actuators. When the mode switch is placed in the defrost or defog positions the A/C is commanded on and the recirculation door is moved to the outside air position to help reduce window fogging. A/C is available in all modes and recirculation is only available in the panel and bi-level modes.
Circuit Description The following DTCs are for the HVAC door actuators: ?€¢
B0248 is for the defrost actuator.
?€¢
B0263 is for the mode actuator.
?€¢
B0408 is for the left air temperature actuator.
?€¢
B0418 is for the right air temperature actuator.
The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The logic circuit inside the actuators receives control signals from the HVAC control module and controls the internal stepper motor. When a door positional change is required, the HVAC control module calculates a commanded door position. The module compares the commanded door position to the actual door position and determines the needed direction of motor rotation. The module applies a signal voltage to the door control circuit that is an input to the internal logic circuit of the door actuator. A 5 volt signal increases the door position. A 0 volt signal decreases the door position. When the commanded door position is equal to the actual door position, the HVAC control module sends a 2.5 volt signal to the door actuator and motor rotation stops. The ignition 3 voltage circuit provides source voltage to the logic circuit. The module provides ground to the actuator logic circuit through the low reference circuit. I would start by having the HVAC control module checked for DTC'S -diagnostic trouble codes First . Then check the system by using scan tool data . 1
Did you perform the HVAC Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - HVAC Systems - Manual

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the appropriate HVAC door actuator ON and OFF while observing the corresponding Door Actual parameter.
Does the scan tool indicate that the value of the appropriate Door Actual parameter changes?
Go to Diagnostic Aids
Go to Step 3

I would

Apr 02, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

Heat does not blow onto windscreen but blows through other vents - whats wrong


What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !

May 07, 2015 | Cars & Trucks

1 Answer

2002 Chevy S10 blows warm air on all settings unless it is set for the vents I replaced the thermostat as had code for bad thermostat


You may have a problem with the blend door motors on the side of the heater box. As one other person said: "Look at the controls right above the driver's feet area toward the heater box". If they are moving properly all the way, when you move the selectors on the dash, then there may be a problem inside the heater box. If they don't move all the way, then the blend door motors may be bad or binding. Another common problem on these is the control head on the dash not working properly. The control head can be diagnosed with a scanner that can read codes for it. Hope this helps out.

Oct 28, 2012 | 2002 Chevrolet S-10

1 Answer

Where is the flapper that makes the air go from floor to defrost


The blend door is in the heater - ac box under the dash.

Jul 21, 2012 | 1996 Chevrolet C3500

2 Answers

Where the fuse box to a 88 ford thunder bird 5.0 liter


The fuse panel is located underneath the dash, to the left of the steering column, next to the emergency brake pedal. You need to remove the under-dash insulation to access some parts of the fuse panel.


If it doesn't have a diagram inside the box, here's one I found online: http://www.coolcats.net/tech/reference/images/fusepanel.jpg


1 15A Lt. Blue Stop Lamps, Hazard Warning Lamps, Speed Control, Cornering Lamp Relays 2 6A - CB - Windshield Wiper/Washer Pump 3

Spare - Not Used 4 15A Lt. Blue Taillamps, Parking Lamps, Side Marker Lamps, Instrument Cluster Illumination, License Lamps, A/C and Heater Illumination, Radio Illumination, Digital Clock Illumination, Autolamp Relay 5 15A Lt. Blue Turn Signal Lamps, Electronic Day/Night Mirror, Lighted Vanity Mirrors *, Backup Lamps, Illuminated Entry, Keyless Entry, Cornering Lamps 6 20A Yellow Rear Defrost Timer, Chime, Back-Up Lamps, Cornering Lamps, Rear Reading Lamps, Trunklid Release, Digital Clock Display, Illuminated Entry, Anti-Theft Module, Turbo Buzzer 7 15A Lt. Blue Fog Lamps (Turbo Only) 8 15A Lt. Blue Courtesy Lamps, Key Warning Buzzer, Illuminated Entry Module, Glove Box Lamp, Door Lock Relays, Radio Memory, Cluster Memory, Outside Mirrors, Tripminder Module, Analog Clock, Anti-Theft Relay 9 30A Lt. Green A/C Heater Blower Motor 10 20A - CB - Horn, Cigar Lighter, Fuel Filler Door, Flash-to-Pass, Speed Control 11 20A Yellow Radio, Tape Player, Premium Sound Amp, Power Antenna, Graphic Equalizer 12 20A - CB - Power Seats, Power Locks, Keyless Entry 13 5A Tan Instrument Cluster Illumination, Radio, Climate Control 14 20A - CB - Power Windows, Power Moonroof 15 10A Red Taillamps, Rear Side Markers, License Lamps, Electoluminescent Coach Lamps 16 4A Yellow Electronic ATC 17 15A Lt. Blue Electronic Cluster, Tripminder Display, Fuel Gauge (non-electronic cluster), A/C Clutch, Speed Control Module, Graphic Warning Display Module, Electronic Blower Speed Controller 18 10A Red Warning Indicator Lamps, Autolamp System, Throttle Position Sensor, Low Fuel Module, Dual Timer Chime, Tachometer, Washer Fluid Level Indicator

May 20, 2011 | 1988 Ford Thunderbird

1 Answer

No heat changed thermostat and just pulled the heater core which seems fine water from kitchen faucet flows thru both ways but cant find any control valve in the heater hoses to see if it is working


firs check both heater hoses are hot to the heater core after it is warmed up. If they are hot the heat cool door is not moving make sure the linkage for the actuator door is hooked up. If that isnt working test the module that moves it.If it is manually or vaccum operated there will be a heater valve inline the heater core hose. Make sure your vaccumm is supplied to the heater box from the engine. If it is staying on defrost you may be missing vaccum supply to the heater control. If it is electronically controlled the door actuator module is bad or not getting power. Sometimes the heater hand controls are the problem. sometimes the dash control separates and gives a vaccum leak.

Dec 11, 2010 | 1991 Oldsmobile Cutlass Calais

2 Answers

A/c and heater only blow air out of defrost


sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.

Mar 30, 2009 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

No heat in front..only in back


PROBABLY THE BLEVIN DOOR MODULE LOCATED BEHIND THE HEATER CONTROL AND RADIO. FIRST REMOVE THE RADIO WITH DIN TOOLS AND THEN THE COVER FOR THE HEATER CONTROL MODULE WITH 7, OR 8 MM IT'S A WHITE PLASTIC BOX IF THE MODULE GOES BAD YOU MAY HEAR A CLICKING TRY TURNING THE LITTLE SHAFT IN THE BOTTOM RIGHT CORNER OF THE MODULE COUNTER CLOCK WISE SEE IF IT HELPS.

Dec 14, 2008 | 1999 Ford Windstar

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