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			I had a similar situation.  With with the manual seat, the height lever attaches to a cable that activates a hydraulic cyclinder.  In mine, that cable had gotten mangled some how.  I could activate it by pulling on the cylinder's attachment point directly with a vise grip, and adjusting the seat height.  I left it that way, since I'm the only driver, don't have much need to change height regularly... 
 
If you move it all the way back and get under there with a flashlight, you should be able to see all the moving parts... 
 
If its a power seat, I have no idea.
		 
		
		
		
		
		
		
			
				__________________ 
				Some kind of happiness is measured out in miles 
2003 Midnight Blue S 
LN IMS Retrofit
			 
		
		
		
		
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