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I searched here and there but I haven’t found the part number for the clutch by itself.
All I see is the unit that consists of the compressor with the clutch or without.
I have the stock Denso AC compressor (that was previously changed) and I would like to get the complete clutch assembly for it. Anyone knows the part number?
I searched here and there but I haven’t found the part number for the clutch by itself.
All I see is the unit that consists of the compressor with the clutch or without.
I have the stock Denso AC compressor (that was previously changed) and I would like to get the complete clutch assembly for it. Anyone knows the part number?
I am not aware of any Mercedes sold in the U.S. in the past two decades that has a clutch on its A/C compressor.
Mercedes fit variable-displacement compressors to their cars which are always engaged. When they introduced this design in the late '90s there was a clutch to protect the serpentine belt in the event that the compressor seized. That was soon superseded with a compressor featuring a temperature-sensitive coupling between the pulley and compressor shaft which in the event of seizing would break due to the friction generated by a slipping belt.
I searched here and there but I haven’t found the part number for the clutch by itself.
All I see is the unit that consists of the compressor with the clutch or without.
I have the stock Denso AC compressor (that was previously changed) and I would like to get the complete clutch assembly for it. Anyone knows the part number?
This spring I very likely have to purchase an A/C compressor. I see them available both with and without a clutch, so I have a vested interest in knowing which is correct.
The attachment from the WIS explains how to replace the compressor pulley on all R230 models. Plainly there is no clutch. The wiring diagram for the compressor shows no clutch. In Star Diagnosis you can take full control of a compressor output, but there is no clutch to engage or disengage. Finally, in the pictures above I see no clutch; I see no wires which would have to exist if there were a clutch.
If I am mistaken about this, I'd sure like to know before I place an order and not after.
Rod 84,
I did look at the very same diagram before asking my question. I’ve seen both designs and that’s what got me confused a bit.
First warmer day and I’ll just pull the thing out. Than will know for sure.
🤔
Look for this same thing. This compressor does have a clutch, maybe not active, but its there. Probably as a safety deal like stated above that serves only a coupling to keep the compressor alway on. Mine exploded yesterday and that's a NO-GO in Texas. The picture above is the exact part I need. Here's what remains of my old one. The guts inside the compressor pulley seem to still be intact. The part number above no longer works, but I found it on eBay. However, it's only available from Australia??? Wierd..
This compressor does have a clutch, maybe not active, but its there.
The broken part you hold in your hand is a coupling. I've never seen one prior to your post. The R230 compressors never used a clutch.
Early '90s cars have a clutch which cycles regularly to engage or disengage the compressor as dictated by cooling demands. In the last half of that decade variable-displacement compressors were introduced, and there was no need for a clutch to cycle. However, the clutch was retained to disengage the compressor for economy mode and also to protect the serpentine belt in the event that the compressor seized. Compressor RPMs were continuously monitored to detect it seizing.
With the introduction of the S-Class in 1998 an electrical signal to the compressor provided for full control of its output. For economy the clutch was no longer needed or used. To protect the serpentine belt if the compressor seized the compressor was fitted with a coupling which would be destroyed by the belt slipping across the compressor pulley.
Yes, it's a coupling. It performs the same function as a clutch by engaging the compressor with the engine but that's where the similarity ends. With that said, it's listed for sale at a clutch. Compressors that have it call it a clutch. Here's an 03 A/C compressor with that part on it and it's described at "with clutch". Can you get just that part in the USA? If not, I just may get an eBay compressor for less money.
Last edited by Blazeracer; 06-05-2020 at 03:32 AM.
An old post I know, my same pulley/coupler is now broken. How do you get this cover off? Is there a special tool? Any insights appreciated.
Denso style 7SEU17C, compressor part# 471-1467 Denso. I can find this pulley with 7 or 8 grooves but not one with 6 grooves.
I did find a pulley that looks different and it is also pictured along with the above pulley connecting to the same compressor.(471-1467) https://eeuroparts.com/product/denso...WfK81fShLQ_1L2
Here is the pulley that I think may be compatible. The compatibility table shows a 2004 SL55 AMG but not a SL500. https://www.ebay.com/itm/375393869453
I'm trying like hell not to change the compressor if it is just the pulley that is broken. It looks like a super bear to get the compressor out.
Thank's for posting that!
I'm going to go ahead and order the ebay pulley and see if it works. It's only $33, First I need to get the cover off and make sure the compressor isn't seized, which may have broken the pulley coupler. I think a pin wrench might work for counter force. Worst case I can get a pulley from a cheap used compressor or replace the compressor. It does have over 200k miles on it after all.
Just FYI, if you have a broken pulley or seized compressor, you can bypass the a/c pulley by installing this shorter serpentine belt.
You run the belt above the pulley instead of below it. The pulley is broken and wobbling and a bit close to the belt, but I can not push it into the belt.
Now you can drive the car until your parts come in, works great!
Ok, was able to get the black cover off. Used a screwdriver to go around and pry it out. The inner spline was a little rusty so it was very hard to get out. Removed the c-clip with a screwdriver. Pulled the pulley off with an a/c pulley puller from Autozone. If you are doing it while the compressor is in the car, I think it's the only one that will work. The pulley bearing was toast. The above link I gave for a pulley that might work, will not work. Here is a link for the new pulley, the only one I could find after a ton of research. https://www.aliexpress.us/item/32568...yAdapt=glo2usa
02-28-2020, 06:38 PM
