dobby909 2 Posted March 19, 2013 basically a long story short, i went to drill out the sheared bolt for my bonnet hinge and removed this large odd looking black box (which was it turns out the resevuor) and unplugged it to the sound of escaping air and now of course my sunroof wont vacuum back shut! how the hell do i get the air back into the system?! any pcitures or clear diagrams are appreciated Share this post Link to post Share on other sites
ORB 227 1 Cars Posted March 19, 2013 Start the engine Share this post Link to post Share on other sites
dobby909 2 Posted March 20, 2013 I started the engine, and the vacuum doesn't work unless the little switch by the latch is pressed... But when the latch is closed the switch isn't compressed so it doesn't vacuum :/ confused Share this post Link to post Share on other sites
ORB 227 1 Cars Posted March 20, 2013 when the latch is open, the rubber seal should compress allowing you to open the sunroof by sliding the glass back. when the handle is closed, the seal should inflate sealing the glass Share this post Link to post Share on other sites
Anthony 1,000 Posted March 20, 2013 With the engine running at idle, it will create a vacuum with lower than atmospheric pressure inside the plenum. This vacuum is used by the brake servo to give you assistance, and by the sunroof to collapse the seal. The purpose of the black box under the scuttle panel is to store vacuum to allow you to open and close the sunroof without starting the engine. When you disconnected the hose, air rushed into the box and the vacuum returned to atmospheric pressure. As per ORB's description above, with the sunroof handle in the closed position, the seal is not exposed to the vacuum and thus stays inflated (for use of a better word, although it's not pressurised) which pushes against the glass and seals it. With the handle in the open position, the valve is opened and the seal exposed to vacuum, which causes it to collapse in on itself, moving it away from the glass, unsealing it and allowing you to easily open and close the roof. Put the handle back in the closed position, and the seal is no longer exposed to vacuum and returns to its pre-collapsed state, re-sealing the glass. You can open and close the roof even without vacuum, but it's hard to move and you risk damaging the seal so isn't advised. Share this post Link to post Share on other sites
chipstick 382 1 Cars Posted March 20, 2013 Quite a clever little idea really isn't it. Share this post Link to post Share on other sites
dobby909 2 Posted March 20, 2013 Cheers for the help guys! I didn't realise or know how it works, but now I do know ill see if ican fix the leak and update you soon! Share this post Link to post Share on other sites
