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Before you go tearing the HVAC apart, which by the way, will take every tool you own, involves drilling and cutting etc. The thing is, there are many parts, vacuum motors, a blend door and its actuator, and a really complicated electrical vacuum control. It's not just one thing. So, If you haven't already, try this....
It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system.
Also, if the blend door actuator is in fact bad, that IS something you can easily replace. Just have a look at the new one so you'll know what you are looking for. By the way, they ain't cheap!
Hope this helps... Let me know what you find.
SOURCE: 1997 jeep g c l looking for the blower motor control modual
check under the dash on passenger side under the glove box and see if your vehicle is listed here www.autozone.com and if it is they have diagrams and pictures
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electric window switch replaced but loating the correct fuse details/wiring details required for replaced tailgate .
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The blend door actuator is probably bad in it causing the warm air to blow out instead of cold air. It is behind the dash.
It may take several hours for a technician to get at it and replace the parts required for it to work again.
SOURCE: 2001 ford winstar. both rear vent window in-op. is
Regards,
Tony
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