Sadly the only way to get in there is to remove the instrument Cluster disconnect the plugs, and then see if you can reach in but you will likely have to remove a large part of the dash. Depending on where in the air duct the rattle is. To remove the instrument Cluster you have to undo the screws. Put the steering wheel on lowest setting, pull off the covering part of the dash, just enough so you can disconnect the clock. Then disconnect clock so you can remove the cluster cover part of the dash. After that you have to remove the screws on the cluster which mount it to the dash.
Pull the cluster forwards slightly, then disconnect the plugs on the back.of the instrument Cluster carefully. Once you have all that done there is a right angle corner of the air duct on the right. You can pry it off there. Hopefully it's something stuck in that section.
Because if it's not. It means removing the rest of the dash accessible clips and pulling the pieces of duct apart at each join until you find the issue. Saying all of this.
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It may just be a loose screw. So check each clip and screw behind the instrument Cluster as you work. Usually caused by wire chaffing behind the speedo. There are a couple of metal brackets that hold the instrument cluster that the indicator wires pass over en route to the hazard light switch. Hazard lights are just an extension of the indicator circuit. Where the wires to the hazard switch pass across the sharp edges of the metal brackets that support the instrument cluster the wires have a reputation for chaffing and short out.
It will start doing it as you pass over bumps at first. Remove the cowling from around instrument cluster and attempt to locate the short circuit. Wrap wiring loom in electrical tape. My dinner plate size hands had trouble accessing it through the aperture even after removing cowling and instrument panel so I had to resort to option B).
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This was after passing over $500 for an auto electrician who failed to fix it properly. Option B) remove steering wheel and dash and retape all the wiring loom across the front of the van. Sounds worse than what it actually is and the whole lot just snaps together when reassembling. I was pleasantly suprised how quickly it all went back together. Soldered up some wires for audio connections whilst I was at it. Intermittent connections on speakers had been bugging me for a while so fixed both issues at the same time. Check other posts on how to remove dash as this was covered in detail.