I've attached a PDF diagram of how to implement the Klima functions using 2 "Ice-Cube" relays. You want to use real "Ice-Cube" relays and NOT the Automotive style relays. The coil impedance is important, Automotive relays use a low resistance coil, ice cube relays use a high resistance coil. If you use a low-resistance coil, you will damage the ACC, it has a maximum burden of 1 amp!

There are 2 limitations here:

1: You will not have a "delayed" compressor engagement based on RPM when starting the car. This isn't a huge deal, the delay was removed from later Klima relays.

2: You will not have the belt-protection function from the speed sensor on the compressor.

Otherwise, all other functions of the Klima relay are left intact.

- The Kickdown is left energized and gets rid of that squirrely relay that was done away with in later models

- The "cutout" switch on the accelerator will cut out the compressor when closed

- The overheat switch in the head will cut out the compressor when it closes

- The ACC will cycle the compressor as it normally would

- The refrigerant switch is in the wire from #10 to the ACC, so the system is still protected from pressures too high or too low.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
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