I'm having an interesting issue with the AC on my 126. The system is fully charged with no leaks, but the compressor will only run for 3-4 seconds before it kicks off. If I turn the ignition switch off then back on, the compressor kicks on then turns off again after 3-4 seconds. After charging the system I had the compressor running for 45 seconds(ish) and the air was cold. Knowing I've had issues with the Klima relay in the past, I ordered the new part thinking it would be the fix. I received the new part today and there is no difference. Where do I go next? What can I trouble shoot?

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1987 300SDL 271,000
1999 E300 Turbodiesel 155,000ish. (Dad's)

Have you replaced the pressure switch?

the 87 I assume you are talking about, has an RPM sensor in the compressor. if it's compromised, it'll act this way. I have a car doing the same thing. I've not yet fixed it...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Yes, the 87. It seems like that would make sense. A few months ago it would run most of the time, but when coming back to idle from rev's it'd turn off. That seems like a fun part to replace... How would I even do that..?

And to reply to an earlier post, no I have not replaced the pressure switch.

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1987 300SDL 271,000
1999 E300 Turbodiesel 155,000ish. (Dad's)