Question about 1996 Ford Taurus

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Air conditioning switch control and defrost control not operational. need to know how to replace them

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  • bawb52 Oct 03, 2010

    The motor works just fine. It's the switches on the dash. Can't switch from ac to defrost ect...

  • bawb52 Oct 04, 2010

    No, I don't think you understand the situation. Sitting in the car, I want to turn the knob from ac to defrost. That is where the problem is. The switch does not work. I need to know how to replace the switch. I think it's just a plug in type unit.

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  • Master
  • 1,796 Answers

Hi!!
The Defrost Control motor is vacuum actuated. check the vacuum line from the engine intake manifold to the evaporator housing for cracks and loose fitting,
Click on the following link for description and R&R instructions for the HVAC system on your vehicle
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c152802601f7
Good Luck!! Don't forget to rate this post!!

Posted on Oct 03, 2010

  • 1 more comment 
  • Rene J Solis Oct 03, 2010

    If the problem is the mix of coo and hot air, then the device that controls that is the Blend Door Actuator. When the A/C is on, it closes the side of the heater core so you only get cool air, if you turn the control to HEATER, it closes the door the other way, so even if your have the A/C on, cool air can't come in. If you feel that the A/C is too cold and the outside plain air too hot, you can mix both streams of air by adjusting the BLEND DOOR. The blend door actuator is electrically operated.



    If the problem is the delivery of the air thru the defrost, front. or bottom ducts, this is managed by the damper door, which is activated by a vacuum control motor.



    Inspection, repair and replace guides are readily available at this site. Just select from the Select a Chapter menu on the left of your screen. http://www.autozone.com/autozone/repairi...


  • Rene J Solis Oct 04, 2010

    IF YOU ARE LOOKING AT THE SAME INTEGRATED CONTROL PANEL AS THE ONE ON THIS PICTURE





    OF THE BOTTOM THREE KNOBS, THE FIRST KNOB IS FOR FAN SPEED AND TURNS THE A/C ON IF THE BUTTON IS PRESSED, THE SECOND KNOB IS TO DIVERT THE AIR (HOT OR COLD) TO THE DEFROST, FRONT OF BOTTOM VENTS, THE MAX A/C POSITION MEANS THAT NO OUTSIDE AIR WILL BE ENTERING THE SYSTEM, THE SYSTEM WILL BE RECYCLING THE SAME AIR. THE THIRD KNOB CONTROLS HOT OR COLD AIR IF A/C IS ON, OR RECIRCULATES THE INSIDE AIR IF THE A/C IS OFF.



    THE SECOND KNOB ACTIVATES A VACUUM CONTROL MOTOR TO SELECT THE DESIRED AIR OUTPUT VENT.



    THE THIRD KNOB IS ELECTRONICALLY ACTIVATED BY THE BLEND CONTROL DOOR MODULE.



    WHEN YOU SAY CHANGING FORM A/C TO DEFROST YOU ARE TALKING ABOUT THE SECOND KNOB AND ALL YOU DO IS SENDING THE AIR STREAM FROM THE FRONT VENTS TO THE DEFROST GRILL, THAT'S ALL. IT DOES NOT CONTROL THE AIR TEMP.



    WHAT PART OF THIS ARE YOU HAVING PROBLEM UNDERSTANDING? LET ME KNOW IF YOU NEED FLOW CHARTS OR ADDITIONAL INFO.

  • Rene J Solis Oct 04, 2010

    IF YOU STILL WANT TO REPLACE THE SWITCH, YOU NEED A SPECIAL RADIO/IPC REMOVAL TOOL SET SOLD AT MOST AUTOPARTS, IF YOU LOOKED CLOSE ON THE PREVIOUS PICTURE, THE TOOL CAN BE SEEN.

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I have a 2006 Pontiac g6 gt and my heat or air will not turn on or rear defrost


You have a computer controlled HVAC system ! It has the capability of setting DTC'S - diagnostic trouble codes !
The HVAC control module is a non-GMLAN device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 3 voltage circuits provide power to the control module. The HVAC control module during defrost mode will change the A/C compressor LED status from on to off. The control head displays recirc, outside air, A/C and rear defrost feedback status through LED indicators. The control head has a rear defrost request switch please refer to Rear Window Defogger Description and Operation in Stationary Windows for operation. The HVAC control head will display NO COMMUNICATION when checking DTCs or doing a vehicle diagnostic system check refer to Diagnostic Trouble Code (DTC) List - Vehicle and Diagnostic System Check - Vehicle in Vehicle DTC Information.
The rear window defogger system consists of the following components:
?€¢
Body control module (BCM)


?€¢
Heating, ventilation, and air conditioning (HVAC) control module


?€¢
Rear Defog relay


?€¢
Rear window defogger grid


Your probably better off taking this to a ASE certified repair facility ! You probably have bad Heater / A/C control panel . HVAC Control Module Malfunction

May 06, 2015 | Pontiac Cars & Trucks

2 Answers

What part controls switching air/heat from defrost to bi-level to floor & where is it located?


In the attached drawing, Part 32 moves Part 26 to direct the air flow to the desired locations. It uses vacuum to operate. The actuator may be bad or the vacuum hose my have come loose when the heater core was changed. With the car running but the blower off stick your head up under the dash on the passenger side and see if you hear a hissing sound. If so it's probably just a vacuum hose come off.
AIR CONDITIONING AND HEATER UNIT BODY Fits DYNASTY LASER LEBARON NEW...

Dec 24, 2014 | Cars & Trucks

1 Answer

I have a 2003 Alero and I can't switch the air conditioning to defrost or the floor. Do I need a new switch or what?


Usually a sign of a faulty blend door - could also be a faulty control on the dash. I would have someone check the blend doors first.

Aug 29, 2012 | 2003 Oldsmobile Alero

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?


This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

Oct 25, 2010 | 2003 GMC Safari

1 Answer

Heat blows out at floor only and ac does not come on even though light Indicates it's on. Has rear defrost and light works..Also has recirculating air button . I'm guessing the whole heating control in...


I would first remove the fuse for the heater control head for one minute and then put in and retry.
The control head could have locked up on you with a volt spike. The rear defrost switch does not go through the same circuit in the heat as the hvac controls. Could be a broken know also.
Could also be mechanical linkage on side of heater box above accelerator pedal may have broken or popped apart. or if electrical motor control may be actuator.

#76-11-01: HVAC CONTROL KNOB SPINS FREELY (REPLACE) - (Oct 9, 1997) 999999995.gif SUBJECT: HVAC CONTROL KNOB SPINS FREELY (REPLACE ALL THREE KNOBS)
MODELS: 1996-97 CHEVROLET AND GMC M/L AND G VANS 1995-97 CHEVROLET AND GMC C/K TRUCKS
CONDITION:
SOME CUSTOMERS MAY REPORT THAT ONE OR MORE HVAC CONTROL KNOBS SPIN FREELY, RESULTING IN LOSS OF FAN, TEMPERATURE AND/OR MODE OPERATION.
CAUSE:
THE KNOB'S PLASTIC INNER SHAFT MAY CRACK WHEN FORCED AGAINST ITS STOP.
CORRECTION:
IF ANY ONE OF THE THREE HVAC CONTROL KNOBS EXHIBITS THIS CONDITION, REPLACE ALL THREE KNOBS WITH NEW P/N 16268157.
PARTS INFORMATION:
P/N DESCRIPTION QTY 16268157 KNOB, HVAC CONTROL 3

Sep 27, 2010 | 1995 GMC Yukon

2 Answers

1998 Buick LeSabre Custom I will turn on the A/C and air will only blow out the defrost vents sometimes it will change over to the proper vents. At times I use to switch it over to heater and back to A/C...


Hi! It may not be a vaccum problem. I think that the hoses that goes thru the main vent is the problem. They may have fall thats why theres no air coming out of the main vents only on the defrosters. Check the hoses and connect them to the main vents and it will resolve this. HOpe this helps and have a good one!

May 17, 2010 | Buick LeSabre Cars & Trucks

4 Answers

Heating / air conditioning control stuck to front defrost vents


There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

1 Answer

1991 chevy g20. 5.7l v8. air conditioning does not work. the blower and switches seem to work fine but it does not cool and only blows out of defrosters.


Blowing out of the defrost is a vacuum problem. You have a leak between the motor and the heater controls. Most likely needs to have the A/C system charged up.

May 29, 2009 | 1992 Chevrolet G20

3 Answers

Air conditioning blowing hot air


ok could be one of 3 things. 1 you may be out of freon. (proly spelt that wrong) 2. compresser could be bad. 3 the clutch on your compresser might not be engaging. when trucks running turn ac on and see if the front of your compresser spins or not. if it does clutch is good. but it could be that your compresser is still bad. either way i recomend you go for freon and start there. when they fill it they will tell you for sure wether or not your compresser is bad.

Apr 29, 2009 | 2004 Ford Explorer

1 Answer

2001 ford focus defroster blows out ac vents


may be just a cable adjustment.


SECTION 412-01: Air Distribution and Filtering 2001 Focus Workshop Manual DESCRIPTION AND OPERATION Air Distribution and Filtering The new heating and ventilation system ensures even air distribution.
The temperature control and air distribution flaps are controlled by two operating cables. All vehicles have a recirculated air function, with the flap controlled by a servo motor.
Air is supplied to the windscreen and side windows regardless of the air distribution setting.
The clean air filter is fitted as standard in most countries. This cleans the incoming fresh air of pollen and dirt particles. It must be renewed after every 40,000 km under normal operation conditions, or after 20,000 km under difficult conditions. If no clean air filter is installed, a plastic grille is fitted over the air intake. This can easily be replaced with a clean air filter.
Air distribution operating switch
Face level The main flow of air enters the passenger compartment at face level.
Face level/floor level The main flow of air enters the passenger compartment in equal parts at face level and floor level, and a small amount flows to the demister nozzles of the side windows.
Floor level The main flow of air enters the passenger compartment at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist/floor level The main flow of air enters the passenger compartment in equal parts at the windscreen and at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist The main flow of air enters the passenger compartment at the windscreen and a smaller amount flows to the demister nozzles of the side windows.
Air distribution operating switch Air distribution operating cables
NOTE: The Bowden cables for LHD and RHD vehicles are identical. However, they are fastened to the air flap operating mechanism with the respective reverse side of their connectors.
The air distribution switch operates with two Bowden cables. The cables operate the air distribution valves in the heater housing.
To remove and install the cables, the rotary switch must be turned as far as it will go to the left. The air flap mechanism engages easily in this position, making the installation of the cables easier.
--------------------------------
Air Distribution Cable Control Assembly Removal
s1y~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
  1. Remove the radio/cassette unit and the CD player (if equipped). For additional information, refer to Section 415-01 .
  1. Remove the bezel with heater/air conditioning controls.
  1. Remove the bezel with heater/air conditioning controls (continued).
    • Pull off seven electrical connectors (six shown).
  1. NOTE: To remove the Bowden cables, turn the rotary switches as far as they will go to the left.
    Remove the bezel with heater/air conditioning controls (continued).
    • Unclip the Bowden cables.
  1. Remove the lower driver's side footwell trim.
  1. Unclip and remove the air distribution Bowden cables.
  1. Unclip and remove the temperature control Bowden cables.
    • Unclip and remove the temperature control Bowden cables.
Installation
  1. NOTE: Route the new Bowden cables without kinks and check for easy accessibility.
    NOTE: To install the Bowden cables, turn the rotary switches as far as they will go to the left. The mechanism engages easily in this position.
    NOTE: The Bowden cables are identical for RHD and LHD vehicles, although they are fastened to the air flap operating mechanism with the reverse side of their connectors.
    Install the components in reverse order.
  1. Check operation of the Bowden cables.

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