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Message: <blockquote data-quote="Nessa" data-source="post: 2445224" data-attributes="member: 234435"><p>We just had an oil change & full engine flush we noticed major improovments w/the van. Our heat acts funny it takes a long time to heat up & @ times will just blow cold air. Today my husband drove home from work everything was fine, when he pulled in the garage & parker he heard a loud blowing/humming/buzzing sound coming from under the hood. The heat was turned off, radio off. Was curious what this could be from? He said it almost sounds like a computor that's on and just sitting/running.</p></blockquote><p></p>