What's the deal with the seat bladders? I think I have leaking ones on mine. How hard are they to replace?
Sent from my iPhone > On Sep 5, 2015, at 10:06 AM, Dan Penoff via Mercedes <mercedes@okiebenz.com> > wrote: > > Thanks! > > I hoping to put an end to the pneumatic issues that I have discovered that > appear to have plagued this car for years. I spent a while studying all of > the records last night, including the complete history from the MB dealership > where it was purchased and maintained for the first ten years of its life. > > It’s had a grand total of four PSE pumps replaced over the years. Right now, > the locks work, and the lumbar bladders would work (one is leaking due to > age) but the back up aids don’t extend. Fuel mileage is marginal as well, so > I’m almost positive there’s a vacuum leak in the system, too. > > If you’re not familiar with the PSE pump in the 90s models, it provides both > vacuum and pressure for door locks, AC flaps, lumbar bladders and in the case > of the W140 from 92-95, these little “antennae” or “sticks” that extend out > of the tops of the rear fenders when the car is in reverse so you know where > the corners of the car are. Mercedes refers to them as “back up aids.” > > The PSE works with engine vacuum in the sense that if engine vacuum to the > system drops below a certain point the PSE will kick in to help out. This > allows AC flaps to work when the engine is not running, primarily for the > ACC’s “REST” function (heat available after the car is shut off.) > > There is a vacuum distribution block in the passenger front footwell that is > prone to leak and often overlooked. I have a new one on order, as they’re > cheap, but I’ll be testing this one today as I suspect that’s where the > problem lies. The giveaway is the loss of AC flaps when engine vacuum drops > due to acceleration. The PSE pump isn’t able to keep up and the vacuum > drops, causing the flaps to go to the default (defrost) position. > > It’s pretty amazing looking back over the records on this car. I’m thinking > the independent they used for the last ten years had a big boat, or a kid > they needed to put through college. > > In less than 80,000 miles, the car has had the following replaced: > > Starter > Alternator > Power steering pump (2x) > AC compressor (2x) > AC evaporator (2x) > AC condensor (2x) > Ignition lock cylinder (2x) > PSE pump (4x) > > It was like clockwork when they would have the car in for service with the > independent and it would need some sort of major work. > > Dan > > > >> On Sep 5, 2015, at 10:50 AM, Craig via Mercedes <mercedes@okiebenz.com> >> wrote: >> >> >> I wish you success! >> >> >> Craig >> >> _______________________________________ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
