Mercedes benz E200 w210 Kompressoris in hunting mode through out. This Benz has a manual gear box. The problem started immediate after switching from automatiebox to manual.

SOURCE: Reverse Lights not working and engine starts on any gear

You have a reverse indicator switch on you transmission. You will need to make sure that it didn’t come unplugged or that the wire didn’t break. This is a single wire that should be close to the rear of the transmission.

SOURCE: switch to 4 wheel drive in Mercedes Benz GL450

You have permanent all wheel drive dude. The system is always ready to go. If you want to do some offroading, activate the "off road" button that looks like a vehicle climbing uphill on the lower, center dash panel. This will allow more slip for the traction control system and hold lower gears longer in the trans

SOURCE: where i can get and mercedes benz owner manual?

http://www.pdfoo.com/result-mercedes-benz-w123-manual-free.html
Try this web site

SOURCE: 1991 Mercedes Benz 500 Class: how do i disconnect central locking on mercedes 19...

Pump under passenger rear seat. But if your having issue its the first thing to check and replace.

SOURCE: cannot locate power steering top up for m/benz 2002 E200

its on the drivers side of the engine near the front of it