How advanced is AC Compressor Clutch replacement? - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 04-25-2019, 09:30 AM Thread Starter
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How advanced is AC Compressor Clutch replacement?

AC blowing warm, got code 419 (ac clutch I guess), and best quote so far for the compressor+drier is 830. Just wondering how hard it would be to do it or part of it myself (only done the blower motor and aux water pump so not a lot of wrenching experience)?
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post #2 of 31 (permalink) Old 04-25-2019, 09:48 AM
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It's not too hard but it does require patience and the correct tools. I don't know what model you have but, here's a link that shows how to do it.

https://www.benzworld.org/forums/w21...ent-write.html
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post #3 of 31 (permalink) Old 04-25-2019, 10:06 AM Thread Starter
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Thanks that is a great write up!
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post #4 of 31 (permalink) Old 04-25-2019, 10:11 AM
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If you want to change the compressor, yes, but if you want to replace the coil have a look at the fine write-up from G-AMG.

https://www.benzworld.org/forums/w14...ch-coil-r.html

Also find out first what the problem is. The coil has a fuse in it so if the compressor is about to seize, the pulley would get hot and open the thermal fuse and letting the clutch release the shaft, so your drive belt is not shredded to pieces.

Make sure that the compressor is not binding.
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post #5 of 31 (permalink) Old 04-25-2019, 10:42 AM Thread Starter
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So it might be just the fuse that needs replacing? I think maybe this happened over the winter when I smelled smoke for a few minutes and there was a bit of burnt oil/rubber? that appeared sprayed from the compressor.
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post #6 of 31 (permalink) Old 04-25-2019, 10:49 AM
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No. The fuse is embedded in the coil assembly. If the fuse opens you get the 419 fault, and you either replace the whole coil, or the compressor. I would go for the latter. Your compressor was seizing and the belt got hot due to slips around the pulley, then the fuse melted to open the circuit and released the clutch, saved you from a broken belt slapping around damaging components under the hood.
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post #7 of 31 (permalink) Old 04-25-2019, 01:59 PM Thread Starter
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Okay thanks, would it be worth trying to recharge the refrigerant before doing all that or at least for the short term? My readings for #7 are 03-4 at night and 5-6 during the day in the sun today.
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post #8 of 31 (permalink) Old 04-25-2019, 02:04 PM
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Try resetting the fault code and run the a/c. If the code comes back, "It's dead, Jim" . No amount of refrigerant will mend the opened fuse in the clutch. If the clutch does not turn the compressor, how will you feed the refrigerant into the system ?
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post #9 of 31 (permalink) Old 04-25-2019, 02:07 PM Thread Starter
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Okay thanks, I tried resetting (holding up and down buttons) but it didn't seem to work. Is there another way? Also I read somewhere that if the refrigerant is too low the compressor automatically stops working and won't until it gets filled back up a bit, does that sound right? https://www.benzworld.org/forums/w21...-clearing.html
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post #10 of 31 (permalink) Old 04-25-2019, 02:12 PM
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Yes, the correct way of resetting the code. see item 9 in the attached (press AUTO buttons simultaneously for more than 2 seconds).

http://manual.startekinfo.com/manual/JSP/cc/3_5/m15.jsp

The compressor will only turn if the clutch engages by the controller, and if you have a coil fuse problem the compressor will not engage, and will not start even it is full to the brim with refrigerant.
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