Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
Pretty common failure on these cars. Usually, however, they jam in the "locked" position and you have to pull the manual release to get it to open. If your's is failing to lock then try spraying some penetrating oil or silicone spray into the plunger area to see if you can get it to free up and work.