I see the klima and OVP
What is in front of klima?
What is each function?

I don't think there's any klima relay by the battery.....usually thats where the MAS/Fuel Computer/OVP reside....

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

It says klima on it.

It depends on what year and what engine.

There might also be a fuel pump relay (FPR), CIS Control Unit, ABS Control Unit, and the Altitude Adjustment Diaphram

2.6, 1989

Huh, these gassers....they're all different. Just makes things difficult.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Behind the battery of my 1988 190e 2.6 Right hand drive model.

OVP
FPR
Klima
ECU
ABS controller

There are a couple of carriages to contain all these units.