Hi All

My idle does not seem to compensate when the compressor kicks in and cause the car to shudder before the idle climbs up again.

I am testing the KLIMA relay at pin 87Z and I get 0.15-0.16 V (compressor off/on). I tested the KLIMA on the bench with terminals 15/32 (12V/gnd) and activating terminal KL (via gnd). Am I testing it correctly and is 87Z supposed to show 12V with compressor on?

KLIMA p/n is 002 545 12 05

Regards
Andrew

__________________
1992 124 E200 (Euro)

no one?

__________________
1992 124 E200 (Euro)

Did I stump everyone???

Anyway - found the answer myself. KLIMA was faulty. Pin 87z was not putting out the 8-10V to raise the idle a split second before the compressor kicks in. Another symptom was engine dying immediately upon warm startup without gas pedal. The compressor was not disengaged for the initial start.

Someone will find this useful

__________________
1992 124 E200 (Euro)

Thank you for this info

Information about KLIMA relays are so hard to find nowadays. I have a fully modified AC system which bypasses the KLIMA relay completely, the problem is that when the AC is turned ON the idle dips down and sometimes it stalls because there is no idle compensation for the AC Compressor.

I've been to numerous forums/mechanics trying to figure out on how to let the ECU know that the AC Compressor is engaged and to increase the idle respectively. No luck.

Until a few days back when I started reading about KLIMA relays (Mine was removed due to the modification). Realized some models came with the pin 87z on KLIMA which was responsible to trigger the ECU to increase the idle for the AC Compresor (pin 4 on female socket). But still didn't know whether it was a good idea to route +12v directly to pin 87z.

Until I saw your thread and confirmed my theory, if you supply pin 87z (pin 4) with +12v when the AC compressor is engaged, idle will increase by ~200rpm

Thank you again,
Regards

jackz08, Have you actually tried this? I have my KLIMA bypassed as well. I had tried from a schematic I found to provide the 12v to a pin (do not remember witch one) and it did not work.

I hope you were successful so I can duplicate your work.

Thanks
Joe

Yes, it works but just make sure to have a small fuse in between

Which year/models does this apply to? An extra 200 rpm could clean up a lot of idle problems even if they have nothing to do with A/C