I have been searching my car for vac leaks in regards to why my locks wont work it was because of a bad trunk element. Now when i lock my door when the is off i hear a hissing sound coming out from the master vac switch (the blk thing in the driver side door with 3 outlets) is it supposed to make that leaking sound? Is there an adjustment on that? By the way I took out the trunk element and blocked it for the time being. Any clues or advice would help......