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  #1  
Old 08-24-2008, 04:01 PM
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What Causes this in the A/C?

87 300 SDL

Hey guys,
The front end of the compressor moves regardless of where to temperature dial is set ( think this is how you turned the a/c on is these benz wasn't it?) Anyways with no buttons turned on and the fans off the front of the ac compressor moves with the back regardless of where I put the temp at and whehter the a/c is on or not...shouldn't it engage and disengage? What does this indicate I need?
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Old 08-24-2008, 04:08 PM
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Quote:
Originally Posted by Turbopugsleylx View Post
87 300 SDL
Hey guys,
The front end of the compressor moves regardless of where to temperature dial is set ( think this is how you turned the a/c on is these benz wasn't it?) Anyways with no buttons turned on and the fans off the front of the ac compressor moves with the back regardless of where I put the temp at and whehter the a/c is on or not...shouldn't it engage and disengage? What does this indicate I need?
Are you saying that the pulley is turning or the compressor is on all the time? The pulley always turns and the clutch on the compressor connects the compressor to the pulley when you turn on the AC. If the compresssor is turning all the time, with the AC off, pull off the wire that goes to the clutch and see if it disengages - if it doesn't, you have a bad clutch. If it disengages, you have an electrical problem.
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  #3  
Old 08-24-2008, 04:21 PM
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what I am saying is that when you look at the complete compressor with the car running the front of the compressor (in front of the belt) is always turning with the engine regardless of what the internal settings are at...
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  #4  
Old 08-24-2008, 04:24 PM
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even with system completely off?
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Old 08-24-2008, 10:10 PM
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with the engine NOT running, try to move the front of the compressor, the clutch plate that actually is connected to the compressor. IF you cannot move this with little effort, the clutch assy is frozen and needs to be replaced. If you can, then the next step is to find out why the clutch is being activated. Another thing you can try is disconnecting the plug on the front of the compressor just to the rear of the clutch assy. Start the car and see if it turns. If not, then start trouble shooting electrical system.
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  #6  
Old 08-29-2008, 03:03 AM
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Well I could turn the front of the compressor by hand...although it was not free spinning(not sure if it needed to be) but I could turn it by hand with just a little effort..though it was not like I could spin it with one finger and it keeps spinning after I stop applying pressure...

I unplugged the back of it and the front of compressor and area around the belt was spinning with it plugged in and un plugged...


Also does that litle black box near the windshield that says Klima and kickdown 12v have anything to do with the a/c?

Also what is the Ice cube relay..that I see for this car on Ebay?
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Old 08-29-2008, 11:15 AM
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Then you have a clutch problem like suggested earlier. The front part of the compressor should spin only when the A/C system is activated.
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