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Registered
2004 ML55
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62 Posts
Discussion Starter #1
Hi,

My dads ML270 W163 Aircon clutch does not engage, we hooked up the Merc Diagnostic unit and the pressure checks out fine @ 6bar. If we force the compressor to engage it doesnt, the terminal on the compressor clutch does give 12V to the clutch. We even forced override the clutch from 12V from the battery. The coil from the clutch measures about 12 Ohm, thus about 12W which seems fine. How is it possible that although the clutch coil has resistance and should be ok that it doesnt engage? Is this a general problem.

NOW the other question. I have a ML55 W163 and my clutch never disengages even when I put it in ACrest mode and or put it totally off. I just found this out by chance this weekend when we checked my dads ML. The centre things keeps spinning , ALWAYS. Does this mean my ML55 clutch is also buggered? Maybe the clutch bearing has seized?

Thanks for the replies.
 

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Dallas, Texas
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7,753 Posts
12 ohm is a bit too high. Normal resistance is about 5 ohm.

From 2002 on ML uses clutchless compressor.
 

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Registered
2004 ML55
Joined
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62 Posts
Discussion Starter #3
12 ohm is a bit too high. Normal resistance is about 5 ohm.

From 2002 on ML uses clutchless compressor.
Went to aircon specialists, aircon runs permanently. Coupling to pump is broken, thus they assume a seazed pump.
 
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