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Vents keep changing on 98 C203

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Old 08-05-2017, 10:29 PM
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Vents keep changing on 98 C203
My vents keep changing on there own. The 2 above the radio keep opening and closing at random times. Any ideas?

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Old 08-06-2017, 05:16 PM
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Check for vac leaks and manifold assist
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Old 08-10-2017, 07:18 PM
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What is the manifold assist?
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Old 08-11-2017, 03:24 AM
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Pose pump supplies vacuum when manifold vacuum is too low
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Old 08-11-2017, 03:25 AM
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Pse pump sorry..
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Old 08-11-2017, 09:54 PM
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Is it in the trunk? The car didn't start doing this until I changed the cabin air filter.
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Old 08-12-2017, 03:00 PM
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Yes in the trunk.
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