W124 Aircon - Car jolting forward

[shurl]

Hello all.
I have a 96 E220 coupe, with what I think (after some pointers from this forum- cheers) is an aftermarket Diavia a/c system.

Now the problem is while its idling say at traffic lights, when the a/c compressor? kicks in (rev's go up etc) it will jolt the car forward. More noticable if at that exact moment you are letting your foot off the brake . not to nice at all.
Is this normal? should the a/c compressor kick in so harshly?

Been told by the garage we bought it off that "that always happens with the 220's"

Cheers for any help.!
S.

 

[teky]

the revs should rise slightly when the a/c comes on thats normal but not to the extent it jolts the car forward like that, i would say there is a problem with the load relay or switch over valve... fuses and relay locations http://www.benzworld.org/publications/pub.asp?id=238

injection data http://www.benzworld.org/publications/pub.asp?id=235


http://www.benzworld.org/publications/pub.asp?id=236