Question about 1998 Oldsmobile Bravada

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My blend door motor in my 1998 Olds Bravada will not quit turning to the hot side. I have tried a new Motor and control head. What else could it be?

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  • sokal04 Oct 01, 2010

    Yeha tried that didn't work neither did replacing the climate control head!

  • sokal04 Oct 01, 2010

    I will take a look at that. I believe you might be on to something which nobody else has been able to help with. Thanks I will let you know how it turns out.

  • sokal04 Oct 01, 2010

    My question is what to do after trying all of the above stated in my question. If you have any ideas that I havent tried please help me out. Im at a loss thus far.

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Check the blend door itself,is this door getting blocked or is this door got cracked.The motor is replaced,the control head is replaced,but is the blend door checked,---- The blend door regulates heat and AC in today's automobiles. Generally the system is set up with air always flowing through the AC evaporator coils, and the compressor is either on or off, cooling or neutral under system control.----Also check the ac line,is the line proper or getting leaked.also check the coolant level is it low or proper.Also check the coolant temperature sensor.For AC, the compressor is on and the blend door blocks air flow through the heater core. For heat, the compressor is off and the blend door diverts air through the heater core. Those are the two extremes, and exacting temperature control is achieved by having the blend door in intermediate positions between the two extremes. If the blend door is broken or getting blocked,it can happen. ----------- Check out.Keep updated.Thanks.

Posted on Oct 01, 2010

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If you have automatic air and heater the programmer is at fault
It has electrical wiring and vacuum lines running to it. It will be made of black plastic and located between the heater box and dash carrier

Posted on Sep 30, 2010

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Hello! The Blend Door Actuator is defective...Cost is around $125...It's rather difficult to replace but can be done with patience...Here is a picture of the Actuator...

My blend door motor in - 4d62c56.jpg



To change the actuator... It can be gotten to by opening the glove box all the way. There is a metal loop on the upper left of the opening that prevents the box from swinging all the way out. The loop will swing out to allow the box to open all the way...You then can look on top of the heat unit and see the actuator. It is on top back by the firewall. It is held in place by 3 screws and has the control wire plug attached. Removing the screws and moving the actuator up will release it from the air mix door. Then just unplug the control wire plug...

Guru.............Saailer

Posted on Sep 30, 2010

  • steve682 Dec 14, 2010

    I've heard the gear inside can crack, but if that happens, wouldn't it just stop the door from moving? Mine keeps going from open to shut every few seconds, as if it were in a calibration or indexing loop constantly (the door does move open and closed). I've tried the RDO/BATT fuse thing and I've disconnected the battery and it still happens. Yesterday, I just disconnected the connector to the actuator once I got hot air. Any other thoughts?

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1998 ford expedition 4.6 liter - when air is turned on hot air blows out , compressor is working. could it be a vent malfunction? all vents work off of vacum except for one that has a motor that turns...


Sounds like it could be the blend door motor that has failed or the blend door itself is stuck or broken. If you have manual A/C controls it could also be the potentiometer(the switch that controls the heat) or if you have EATC it might be the complete head unit that needs to be replaced. More than likely it is the blend door motor that needs replacing so that would be where I'd start testing first.

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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 .
-------------------------------------------------------------------------------------------------------------------------------------
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.
-------------------------------------------------------------------------------------------------------------------
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.

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Still looking for a solution for my 98 Olds Bravada. Will only blow hot air. We've changed the blend door motor. Still only turns to the hot side. We've changed the Climate Control Head and the blend door...


Check your wiring with an ohm meter. Also ckeck the plugs at both ends and make sure there aren't any pins pushed out or bent. And just to throw this in, you may have bought a bad motor. You have other motors on the plenum, try swapping them to see if you get results. If they are accessible. Good luck

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My 98 olds bravada started blowing hot air even when the air and heat is turned off .....my heat and air both dont work now ..... any solutions?


Either the entire control panel has gone out or the door actuator motor has stuck or stopped working - real pain to change - behind the glovebox - has screws on top of actuator that are almost impossible without a swivel 1/4 wrench

Aug 22, 2010 | 1998 Oldsmobile Bravada

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Does the AC come on and stay on? If so it will be either in the heater control head or a blend door or blend door motor!

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The control switch when turned to cold remains very hot.


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Help


You probably have electronic climate control. Some models have this others have a vacumn operated system. If the vac system the part is about $50-100 aftermarket and easy to do yourself. If elec the part is available dealer only and about $200 last I checked. Your problem is the blend door. This is located on the pass sd under the dash. Starte your car and look under the dash in the back you will see the steel shaft rotate. The problem is GM put a plastic gear in the motor and it does not last. This is hard to get to but you can do it without taking out the whole box. 2 screws to take off then just lift off. Easier to get off than put back on. Hard to believe people buy Toyota and Nissan. This should have been a recall but, I guess if it can't kill you the U.S. is not going to do anything about it. Hope this helps. P.s. There is a small chance that it is the assembly that controls the door motor. This is your actual controls on the dash. Go get a used one from a junkyard for $40 very easy to install 20 minutes.

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