I spent some time troubleshooting my A/C problems on the W124 this weekend.

I found that if I jump terminal 30 and 87 where the Klima relay sits, to engage the A/C the A/C would engage, the engine made a noticable drop in RPM and after 1-2 seconds the fuse blew.

Does this mean a seized compressor or bad clutch?

If at worst case the compressor has to be replaced, will it make sense to replace it with a R134a compatible one and replace the other necessary parts while repairing the system? Or are the only replacement compressors we can buy R12 only?

I assume the fluid in the system has to be replaced, or can it be evacuated and put back into the system after replacing the A/C compressor?

I read a bunch of recent posts and searched the archives but didn't quite find a clear answer to all of this.

Thanks!

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99 W210 E220 cdi sedan automatic (248.000 km) 210.006

first thing you need to do is ohm out the coil assy and see if it is shorted. These coils should only draw 4.2 amps cold 3.7 amps warm.It sounds like you coil(clutch hub assy) is shorted. You can replace this on the car with a special clutch removal tool without breaking the system loose. I always get my clutch hub assy from local dealer in reman, that way I know the quality and they stand behind the warranty. Good luck

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euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck