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Probably dirty contacts in the switch.
The passenger window on a windstar is best installed by a professional. However, if you have some auto repair experience, you can easily remove the door panel on the door by removing the screws and then you will be able to install the new window.
If your windows still work on the switch than it is most likely that the switch is bad I had the same problem with mine and it was the switch
Before replacing the thermostat or any other component of your Windstar's HVAC system, be sure to check your blend door for functionality FIRST. The most common issue with heat or A/C in the late model Ford windstar is a broken blend door. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair.
Turn the door switch located at the front of the overhead console to off.
This happened to my 95 Windstar-I just replaces the fuse for the air mixture door. On my 1999 Ford Windstar, the blend door itself broke. This repair is more costly and more difficult, perhaps $700 to $1000 to replace. I just tied a shoestring to my blend door. When you insert the blend door actuator if there is no slot for it the door is broken and you are up sh... creak. Hope it is the former. Another option is from a company called HeaterTreater - a method to repair a broken blend door without removing the dash. I haven't tried it, but the ideas behind it seem to make sense - and they have lots of videos showing the processes. http://www.heatertreater.net/Windstar%20Listing.html
The door switch for the VW Polo can go bad and cause the interior light to stay on. The switch must be changed, there is no way to repair it.
The most common problem with heat and a/c in the Ford Windstar is Blend Door failure. The Blend Door actuator on the Ford Windstar can be found by removing the glovebox. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair. Linked here is a video from www.heatertreater.net demonstrating how to access components of the plenum box for repair without disassembling the entire dash.
The Blend Door actuator on the Ford Windstar can be found by removing the glovebox. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair. Linked here is a video from www.heatertreater.net demonstrating how to access components of the plenum box for repair without disassembling the entire dash. heatertreater.net/Windstar%20Video.html This details the best DIY option on how to replace a broken blend door or actuator.
Once the door panel has been removed, it should be pretty evident how the switch mounts to the panel itself.See "Related Questions" below for lots of information on removing the door panel...
Ford Product? Spray door latch mechanism liberally with WD-40 Open and close door a few times Spray latch mechanism with silicone
Before replacing the thermostat or any other component of the Windstar's HVAC system, be sure to check your blend door for functionality FIRST. The most common issue with heat or A/C in the late model Ford windstar is a broken blend door. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair. demonstrating how to access components of the plenum box for repair without disassembling the entire dash.