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Air conditioning a/c switch will not change from blend no matter what position its in

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Get a new switch. try a junkyard after you find the price at a part store.

Posted on Jul 02, 2008

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Air blend door actuator


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The blend switch is the knob that changes from heat to cool. It moves a blend door in the heater plenum that is under the dash near the glove box,

Jul 27, 2012 | 1999 Chevrolet Silverado 1500

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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

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My air condition wont blow air out the front dashboard vent but will blow out to the floor an defrost why is that what could be the problem


In other words, no matter how you set the vent selector it will not change where the flow of air is coming out? It is very likely that your blend do has lost either a vacuum line that moves it or a busted spring for returning it to its localized position. you will need a philip's head screw driver, a set of 1/4" sockets, and an accommodating ratchet for this job. (if you are doing the work yourself I will help you with the steps. Let me know and I'll post them up.

Jun 26, 2011 | Buick LeSabre Cars & Trucks

1 Answer

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The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.

Jul 25, 2009 | 2005 Chevrolet Silverado

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My a/c won't blow cold and heater doesnt get hot


Is the heater working? Turn the A.C. off with the car at an idle. Turn the A.C. on and listen for the compressor to turn on. (should hear a click under the hood and the motor should change pitch. If no noise, the compressor is not comming on. The o-rings were bad about leaking on these cars, letting out all the freeon. If there is no freeon, the low pressure switch won't let the compressor run.

May 20, 2009 | 1997 Ford Taurus

1 Answer

Aircondition blows hot air on normal but blows cold air on max


The temp blend door rotates between allowing heat through the heater core, or cold air through the a/cevaporator, or a blending of the 2 by being anywhere between the two.

I would check the heater a/c control head first and hope it's just the control head.
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here is a descripton of the system.

Section 12-03A: Air Conditioning, Heater System, Manual, Ranger and Explorer 1996 Ranger and Explorer Workshop Manual
DESCRIPTION AND OPERATION A/C-Heater System, Manual The manual air conditioning/heater system used in these vehicles is a split-case, blend air design. This design includes the following major components:
  • An A/C evaporator housing (19850) which is attached to the engine compartment side of the dash panel (01610). This assembly includes: (1) the A/C evaporator core (19860), (2) the suction accumulator/drier (19C836), (3) the A/C cycling switch (19E561), (4) an internal, A/C evaporator core orifice (19D990) located inside the inlet line to the A/C evaporator core, (5) a blower motor (18527), (6) a blower motor wheel (18504), (7) a heater blower motor switch resistor (18591), and (8) the A/C evaporator case (19897).
  • A heater air plenum chamber (18471) which attaches to the passenger compartment side of the dash panel. This assembly includes: (1) the outside/recirculating air inlet door, (2) the panel door, (3) the floor defrost door, (4) the temperature blend door, and (5) the heater core (18476).
  • Other components which link and/or control the heating and air conditioning systems include: (1) the A/C control (19980), (2) the ducts and registers, (3) the windshield defroster hose nozzle (18490), (4) the control cables, (5) the vacuum lines, (6) the refrigerant tubes and hoses, (7) the A/C compressor (19703), and (8) the A/C condenser core (19712).
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The A/C control (19980) assembly consists of three main parts:
  • The function selector knob, a vacuum selector valve combined with an internal electrical switch.
  • Heater blower motor switch (18578), an electrical switch that provides four speeds of A/C blower motor operation.
  • A temperature control knob, which controls the position of the temperature blend door mounted on A/C evaporator housing (19850) assembly.
---------------------------
Temperature Control
The temperature selector actuates a variable resistance switch. This switch varies the voltage to an electric actuator used to position the temperature blend door. Positioning the temperature control in any position between COOL and WARM causes the temperature blend door to direct more or less outside air through or around the heater core (18476) for whatever proportion of heated or unheated outside air is desired. The air blends together as it leaves the heater core and enters the heater air plenum chamber (18471) for distribution.
---------------------------
System Airflow Description Air is drawn into the system by the blower motor (18527) through the outside-recirc. door opening. The air is blown through the A/C evaporator core (19860) and then the heater core (18476) (when the temperature control is moved toward the WARM position). When the temperature blend door is in the maximum COOL position, the air bypasses the heater core. When the temperature control is moved to the right, away from the maximum COOL position, air passes through the heater core where it is warmed, and then mixed with the cool air before it is discharged through the registers. OFF
With the function selector in the OFF position, the outside-recirc. door is in the recirculated air position. It is closed to outside air and no air passes through the system. The blower motor is off. MAX A/C
NOTE: No temperature modulation is possible in the MAX A/C position.

In the MAX A/C position, the outside-recirc. air door is in the recirculated air position. All of the air discharges through the panel registers except for a small amount of floor bleed. The A/C compressor (19703) operates in this function control setting.
--------------------------------
You have to almost remove the dash to get this part out.
Removal
  1. Disconnect battery ground cable.
  1. NOTE: Refer to Section 01-12 for instrument panel removal and installation procedure.

    Loosen instrument panel (04320) and pull back from cowl.
  1. Remove A/C electronic door actuator motor electrical connector from bracket on A/C evaporator housing.
  1. Remove three A/C electronic door actuator motor retaining screws.
  1. NOTE: The mounting bracket remains in place on the A/C evaporator housing.

    Lift A/C electronic door actuator motor vertically approximately 12mm (1/2 inch) to disengage it from bracket and actuator shaft, then pull A/C electronic door actuator motor back toward passenger compartment.
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Apr 25, 2009 | 1996 Ford Explorer

2 Answers

97 mustang air conditioning


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 cabin/passenger compartment.

Jun 23, 2008 | 1998 Ford Mustang

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