Question about 1999 Buick LeSabre

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I have a 99 LeSabre with dynaride. I had a problem with it deflating on the high way. I would pull over, shut it off, start it, the compressor would fill it up, travel 50 or 60 miles and it would do it again. Just the high way. Not in town. Two weeks ago, my wife comes home and the dynaride is fully inflated and it wont come down. I havent touched any thing since it all started. Any suggestions?

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Seems like the problem is in the level sensor, the compressor is obviously working and so is the vent valve if it is draining down sometimes and airing up others. I would start with a height sensor

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