w220 trunk hydraulic pump made in china

The Mercedes-Benz W221 is a chassis code of S-Class, the successor of the Mercedes-Benz S-Class (W220) and the predecessor of the Mercedes-Benz S-Class (W222). The S-Class are the flagship vehicles of Mercedes-Benz and each generation typically introduces a range of technical innovations and developments that over time will find their way into smaller cars.

The W221 S-Class" exterior styling is distinctly different from the W220. The W220 somewhat broke with tradition in being smaller than its W140 predecessor, whereas the W221 is once more larger in all dimensions than its predecessor, offers more interior space and has improved performance. The W221 looks are often said to be more imposing than those of the W220. The rear styling is similar to the Mercedes-Benz Maybach – the larger saloon from Daimler AG"s other flagship brand, which was presented to the public in 1997. Development began in 1999, with the design work beginning in 2000 at the Advanced Design Center in Tokyo, and the final design by Gorden Wagener at the Sindelfingen Advanced Design Center being approved in 2001, frozen for production in early 2002 and patented in Japan on May 21, 2003, under 1208488 and in Germany on December 4, 2003.

Inside, the W221"s interior is also significantly different from the preceding model, even more dominated by leather, wood and metal. Where the W220 still had a fair amount of plastic fascias and switches, the W221 has replaced most of these by more luxurious materials such as wood, leather and metal. The interior features an instrument cluster with two large flat panel screens, one for the hard disk based COMAND system which includes the navigation screen and one replacing the analog speedometer by a graphical representation of it, which can display a range of additional information and can also be replaced by the Night View Assist display. Below the central COMAND screen are silver effect air vents, and a square, analog clock within the vents. Below the vents are metal tab switches with a black field behind them, to control the HVAC system (these functions are all also accessible via the COMAND system, which also offers access to some additional HVAC functions, such as foot-well temperature settings and air flow control).

Electronic Stability Program (ESP): standard on the S-Class since the W220 model and similar to the systems fitted to other Mercedes vehicles, this system measures driver inputs and compares these to the vehicle"s path. If these diverge, ESP brakes single wheels selectively to eliminate oversteer (fishtailing) and understeer (plowing), and reduces engine power, if necessary. ESP includes anti-lock braking (ABS) and traction control (ASR) within its wider functions.

Distronic Plus radar controlled cruise control (optional, standard cruise control on other cars), an evolution of the Distronic system introduced on the W220, which maintains a safe distance to the previous vehicle and now can bring the car to a full stop if necessary.

Pre-Safe and Pre-Safe Plus for vehicles with Distronic Plus: a development of the previous Pre-Safe system fitted to the W220 S-Class, which uses vehicle-dynamic sensors to predict collisions and trigger precautionary measures to protect the vehicle occupants, the W221"s Pre-Safe Plus system also takes into account closing speed, as measured by the vehicle"s radar. If a collision appears likely, Pre-Safe closes all windows and the sunroof, moves all passenger"s seats and their head restraints to a safer position, and tightens the seatbelts. It also inflates the air chambers in the side bolsters of the optional multi-contour seats and (from 2006) engages Pre-Safe Brakes in order to reduce speed and therefore severity of impact.

air suspension, an evolution of the suspension system introduced on the W220, using compressed air instead of steel springs to provide a softer ride with better handling characteristics at the same time and adaptive electronic control (known as Adaptive Damping System) to sense road and driving conditions and produce a sportier or softer ride. Airmatic also allows the vehicle to be raised by pressing a button in order to increase ground clearance while lowering the body at higher speeds. Airmatic is the standard suspension system for all S-Class models apart from the S 600, S 63, and S 65 AMG which are all equipped with Active Body Control as standard.

A new hard disk based COMAND system is standard on the W221. Compared to the W220 COMAND this one is even further integrated and provides access to more functions than before. The COMAND controller is now much larger, includes haptic feedback and is installed prominently on the centre console. The Hi-Res 8" main TFT colour COMAND display screen is mounted higher and more directly into the driver"s line of sight. The brightness and tilt of this screen can also be adjusted. In addition to the GPS navigation system, COMAND also offers command and control over the radio, CD/DVD, video, address book and telephone functions and can be used to control many other vehicle and equipment settings (including multi-contour seats, rear window shade and the HVAC system). There is also a "favourite" button to which one can assign a frequently used function.

Linguatronic voice command and control is available as an option and includes more functions than on the W220, including voice entry of navigation destination.

It is a replacement of S 320 CDI with improved fuel efficiency. Changes include: on-demand electric hydraulic power steering pump, standstill decoupling for the 7G-TRONIC automatic transmission, and 17-inch light-alloy wheels with reduced rolling resistance tyres.

Airmatic systems on earlier cars tended to fail more often than on the "03 and later - the "04s and on are less problematic. However, there is no such thing a "bulletproof" pneumatic suspension system. Seals and pumps will wear, and struts will have to be replaced. You"d have to do the same thing with standard shocks, too - but Airmatic will be more expensive. The best protection is to become familiar with the early signs of Airmatic problems, and fix them right away. Letting them go runs the cost up.

Another common weakness in the pre "03-ish W220"s compared to those from a few years later, is the seals at the tops of the front suspension struts. The older design can leak air over time. The newer models and ones with new replacement parts do not leak. Cars that were under warranty could have these seals replaced with that coverage.

The W220 AIRmatic system is a fully supporting air suspension system which provides both static and dynamic support by means of four air struts located at the wheels. Each strut has an air spring containing an air bag (bladder) and a dampener built-in to the one unit. The struts get air via a valve distribution unit from an air compressor located behind the front bumper close to the front right wheel well. On the opposite side is the central reservoir which stores air pressure for use when the pump is not running. The valve unit is connected to a computer which monitors the air pressure, the vehicle weight, the vehicle height requirement and vehicle stance (angle) and then sets the ride height accordingly.

A parked vehicle is "woken up" before the engine is started. That is to say, the AIRmatic with ADS control module receives signals from the door contact switches, the trunk switch and infrared remote control indicating that the driver may soon start the engine and drive the vehicle. The current vehicle level is checked immediately and corrected if required. The vehicle level at the front axle is considered to be critical, for instance, if the full wheel angle can no longer be guaranteed. In this case a message appears on the multifunction display in the instrument cluster to warn the driver: "Stop car too low".

Front struts on W220s up to about 2004 did not have epoxy installed at the factory. Also many of the older style front strut have now been modified with mastic or epoxy added. Note: The epoxy is not the seal for the upper strut. It is a vibration damper to help the narrow neck of the brass valve at the top of the strut avoid cracking and leaking due to vibration. If you have a leak in this older style front strut there is a kit you can buy to fix the leak (top seal repair kit A2203202538, see below). Scraping out the old black epoxy and filling it back in will not fix this. The part that leaks is a half metal and rubber cap under the black epoxy and is secured with a metal lock ring. The newer seals have rubber mastic compound poured in the center to seal the circumference of the upper metal cap on the upper part of the front strut and to keep the brass fitting from breaking off.

Since Bilstein is OE manufacturer for W220 AIRmatic struts, it is possible to buy OE struts directly from Bilstein much cheaper. It is possible to purchase a brand new Bilstein strut for about EUR 700.

A mechanical spring version of the complete suspension strut which eliminates the pneumatic parts can be bought from Strut masters. This requires both sides to be replaced as a minimum, and possibly all four wheels should be done together. This method uses clever electronic components to "trick" the W220 computers into sensing that an AIRmatic is actually installed so that error messages are not displayed. The BIG disadvantage is the loss of air suspension ride quality, automatic leveling and damping options. In some countries such modified cars will not pass annual technical inspection.

Note: If the AIRmatic leaks substantially it is imperative that it be fixed as soon as possible or else the AIRmatic pump may burn out. If the leak cannot be fixed immediately remove the AIRmatic compressor relay (K40/7kO) to disable the AIRmatic Pump. For the relay and fuse locations see above. However BE WARNED, the vehicle may leak enough to be not drivable when turning the front wheels causes them to touch the top of the wheel arch (for 18" wheels and larger).

This error code is shown when the AIRmatic system supplies or releases air from the strut, but does not observe the intended effect (likely level sensor or pressure sensor does not show the expected result). For example, it has been reported to appear in case where hoses on the valve block were mixed up. The AIRmatic system thought that it is pumping air in reservoir, but actually the air was passed to strut (and vice versa).

It is possible to replace a damaged Air Bag/Bladder (h), however, the rubber Air Bag/Bladder is attached to the strut tube and strut top with crimp rings. This requires access to an hydraulic crimper, which is not easily available for a DIYer.

The seals at the tops of the front suspension struts develop leaks. This issue was more common with the older design in the pre "03-ish W220"s compared to those from a few years later. There is available an epoxy repair kit that can be used to close the cracks. A professional repair costs around US$550 parts and labor for both sides.

Note the newer W220"s post "03 and ones which have been modified with new replacement parts do not leak at the top seal which is an "O" ring around the metal cover disc. The top of the air suspension strut on these later models is filled with a butyl mastic compound to reduce vibration on the residual valve inlet connection.

It is possible to purchase on eBay a refurbished front and rear air spring which is the top part of an air suspension strut for around EUR 120 and mount it to the original damper unit (the lower part of an air suspension strut). This requires the strut to be removed from the car and the air spring to be separated from the damper unit by partly dismantling the air spring. Note: Replacing only the strut"s rubber air bag/bladder (h) of the air suspension strut is not suitable for a DIY project as it requires an hydraulic crimping tool.

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