I need to access my K40 relay on my 99 C230K W202 for a possible burnt solder joint and I opened the box but not sure which one it is. There is a orange relay/fuse looking thing with "40" on it but not sure if thats really it.

Here are some pics...maybe someone can circle the K40.

Attached Thumbnails

   

__________________
99 C43
98 S420
99 C230K
01 C240

it is the one with the fuse on it, the whole thing is the K40

So the whole unit with that orange fuse type thing I pull out correct?

__________________
99 C43
98 S420
99 C230K
01 C240

yes,

That car like most from 1998-2001 has 2 K-40 relay "GROUPS"

There is K40/4 in the passenger side computer box!

There is also a K40/2 in the drivers side fuse/computer box.

WHAT type of problem is the car having?

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

The car is having an issue with the boost when accelerating. IT is not very strong anymore and the kompressor is indeed engaging...aswell it doesnt run with cold starts anymore like its supposed to (making that tractor sound at cold idle) instead its smooth and quiet.

It gets its full boost when accelerating from a stop to redline but going on the highway and kicking it down...nothing...normal aspiration.

__________________
99 C43
98 S420
99 C230K
01 C240

MARKO, did you finally figure this out? Yes I know it's been a while but 2 years later I am haivng the same exact issues.

__________________