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Rattling sounds when ac is off


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usmarine0622
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Apr 6, 2012, 12:06 PM

Post #1 of 11 (3732 views)
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Hey guys my wife has a 2001 Chevy Impala, she noticed that ac wasn't getting cold when she turned it on. I checked the Freon level and it was pretty low so I had it recharged. It works fine besides the fact that when she turns the AC off there is a rattling sound coming from the hood. When she turn the Ac back on the rattling goes away. I'm pretty sure it's the AC compressor because it did not happen when the Freon was low. It just started up when the Ac was recharged. Any thoughts?


Hammer Time
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Apr 6, 2012, 12:08 PM

Post #2 of 11 (3728 views)
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If it only happens when it's off, then it's likely a bad clutch on the compressor which means new compressor and dryer but that needs to be verified.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



usmarine0622
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Apr 6, 2012, 12:17 PM

Post #3 of 11 (3721 views)
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In Reply To
If it only happens when it's off, then it's likely a bad clutch on the compressor which means new compressor and dryer but that needs to be verified.


Thanks for the reply, I had a feeling that was the problem but I wanted to get some input first before I went to a mechanic and they tried to tell me that i need to buy half the parts in his shop.


Tom Greenleaf
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Apr 6, 2012, 12:29 PM

Post #4 of 11 (3716 views)
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A/C clutch bearing would do that and could be replaced or new clutch usually but not always. Whole NEW compressor with a NEW clutch may be needed.

Allowing that too long isn't a maybe it will be a problem such that car is disabled if belt is not just dedicated to just compressor and doubt it is,

T
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Hammer Time
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Apr 6, 2012, 12:44 PM

Post #5 of 11 (3704 views)
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They may not be far off. Once the system is opened, the accumulator and orifice tube have to be changed. I would try just changing the clutch because the heat generated by the bad clutch will usually take out the front seal and then you will be replacing the compressor anyway along with another clutch that comes with it.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



usmarine0622
New User

Apr 6, 2012, 2:45 PM

Post #6 of 11 (3672 views)
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ok cool thanks for the reply, ill have it checked out


Tom Greenleaf
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Apr 6, 2012, 11:59 PM

Post #7 of 11 (3652 views)
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Bite! The accumulator has nothing to do with this so forget that if only the clutch. In fact just trying to replace one can cause unreal other damage so if not mandatory leave it alone. Done - period! Didn't waste years of college not just tech bull to learn this crap so fluck them all! Age takes it toll thoughMad

T
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Long retired now


Hammer Time
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Apr 7, 2012, 6:33 AM

Post #8 of 11 (3642 views)
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I disagree here. Something made that clutch fail and i would suspect that it was either a compressor locking up or pushing excessively high pressures so yes, you should change the accumulator and orifice tube along with the whole compressor and possibly a condenser too if it turns out to be the reason for high pressure. Most parts suppliers will not guarantee the compressor without installing an accumulator also.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Apr 7, 2012, 9:01 AM

Post #9 of 11 (3634 views)
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I too disagree. Bearings do go bad alone for no reason. Most or the ones my way can be replaced for my cost about $12 bucks plus insane time to get the dang thing off and to a workbench. Some may require recovering refrigerant to do this and whole compressor off. Some snap rings some are "peened" in and can do that - can you?

T
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Long retired now


Hammer Time
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Apr 7, 2012, 9:18 AM

Post #10 of 11 (3628 views)
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When pulley bearings fail they cause the pulley to lean and rub on the clutch plate which will create heat and heat damages front seal. This is a pressed on clutch and can't even be done without special tools, if you can even find a supplier that sells clutch parts for it.. A complete clutch assembly which is what would be needed, can easily run over $100 when a new compressor with clutch can be bought for under $200




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Apr 7, 2012, 9:47 AM

Post #11 of 11 (3622 views)
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This will fail without some hands on and eyesight inspection of what and why IMO.

Plain English. Do It Yourself for "Motor Vehicle Air Conditioning" is mostly, near always for professionals or leave it alone!

If even disabled some cars need the dang compressor as part of the pulley set up - which is engine and vehicle design not mine but at least that is required in some now many. Disable kits are available,

TomMad




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