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No there's no vacuum, you've got a bad switch. The electricals in these are a POS. I had an 87 300D and I know. I had a similar problem with mine but it was the other way around. I could only close them. Sometimes they worked, sometimes they didn't. I never liked my 87 I had so I got rid of it.
Good luck with your car.
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DJ
84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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