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Old 04-18-2006, 08:39 PM
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Join Date: Apr 2006
Location: tx
Posts: 55
Post A/C Clutch Coil R&R

Men, I have searched the threads and no one has covered this topic.

My 89 190E 2.6L gas/auto needs a new a/c compressor magnetic coil for the clutch.

It looks like a tough job just to get to it. I can see 4 bolts holding the compressor on from underneath. Please chime in and answer any or all of these questions.

1) Can the clutch be changed without pullling the Compressor off the car?

2) Can the compressor be pulled off the car without pulling the radiator/condenser?

3) Are special tools required to disassemble the clutch to gain access to the coil? If so, where to get this tool?

I am looking for any and all hints/tips here. I am lazy and I dont want to spend all day at it. My coil ohms at 0.07 ohms and it fries my Klima Relay. The compressor and everything else is Ok. I just freshly charged it with freon, so I don't want to re-open the system.

Any thoughts/experiences.

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Old 04-18-2006, 10:28 PM
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Join Date: Oct 2004
Posts: 4,156
The clutch is replaced with the compressor off the car. It is held by snap rings that cant be accessed on the car due to it's location not to mention the wiring and associated connector will be a huge pain trying to disassemble and reassemble on the car.. Radiator doesn't have to come out. After recovering your refigerant the compressor will unbolt and come out thru the bottom. As long as your have evac and recharge equipment you only need 6mm allen, metric sockets and snap ring pliers. Two or three jaw pullers can be helpful if the bearing assembly is stubborn coming off of the compressor. As for tips, don't misplace the tiny spacers that set the gap for the clutch.
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Old 04-19-2006, 12:32 AM
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Join Date: Apr 2006
Location: tx
Posts: 55

Alright. I pulled both benzs along side each other and prepared for the swap. I loosened the 3/4 tensioner bolt beside the powersteering pulley. Loosened the 13mm belt adjustment fastener. Removed the serp. belt. Removed the 3 pin wire connector (2 pins for clutch, 1 pin for speed sensor) Removed bolt that holds the high and low side manifold to the compressor using a 6mm allen socket, 3 inch 3/8 drive extension. Removed the 4 compressor housing bolts using 13mm socket. Compressor came out the bottom. I got 1 compressor out, and on the other car, it is out except for 1 bolt that I need a shorty 13mm socket for (i will buy one in the morning) I think that I might just swap the whole compressor unit out instead of trying to r&r the clutch & coil. I would say that I am inches away from a job well done. Thanks.


I did a search and I found this page for maintenance on the a/c comp. Its for a Toyota Supra, but same thing. Heres the link.

Last edited by prevost3000; 04-19-2006 at 01:11 AM.
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Old 04-19-2006, 12:48 AM
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Join Date: Aug 2005
Location: Palmdale/Ventura, CA
Posts: 813
I don't have your model, but a comment on the clutch.

Just removed clutch with compressor in car using AutZone free tool loan/rental.
Wanted to avoid empty and recharge also. Could not get to coil part of clutch
Worse - Could not get a reliable source for the clutch at a price less than a whole compresor.

I contemplated buying the new compressor just to take off the clutch.
I still may do that.

Anyway - sounds like you are on your way to gettting this done.

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