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Old 08-27-2020, 03:00 AM   #1
Yaris044
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Drives: Yaris automatic 2004
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Rattling sound on Yaris when A/C is off

I own a toyota yaris 1.3 automatic. I have a weird rattle sound when idle and very noticeable when starting acceleration but only when the A/C is OFF. As soon as I turn A/C on, the rattling sound disappear.
Maybe something with the A/C?
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Old 08-27-2020, 07:04 PM   #2
ex-x-fire
 
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Most likely the a/c compressor clutch.
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Old 08-28-2020, 07:52 PM   #3
Konstantin88
 
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In my 2009 Yaris 1.5 a metal AC line on the passenger side of the engine bay was almost touching the body of the vehicle at one spot. The line would often rattle against the body on acceleration, it was extremely annoying. The rattle would come and go depending on the temperature and whether the AC was on.
https://photos.app.goo.gl/eXzseCzwWiTwVe8F7

Last edited by Konstantin88; 08-28-2020 at 08:30 PM.
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Old 08-28-2020, 10:33 PM   #4
06YarisRS
 
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Quote:
Originally Posted by Konstantin88 View Post
In my 2009 Yaris 1.5 a metal AC line on the passenger side of the engine bay was almost touching the body of the vehicle at one spot. The line would often rattle against the body on acceleration, it was extremely annoying. The rattle would come and go depending on the temperature and whether the AC was on.
https://photos.app.goo.gl/eXzseCzwWiTwVe8F7
Nothing a pry bar wouldn't fix. I twisted and contorted most of the tubing in my A/C system to make room for both my engine swap and turbo kit install. Never developed any leaks as a result. The aluminum tubing is fairly receptive to being bent so long as it doesn't kink, I guess.
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Old 08-28-2020, 11:33 PM   #5
Konstantin88
 
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Quote:
Originally Posted by 06YarisRS View Post
Nothing a pry bar wouldn't fix. I twisted and contorted most of the tubing in my A/C system to make room for both my engine swap and turbo kit install. Never developed any leaks as a result. The aluminum tubing is fairly receptive to being bent so long as it doesn't kink, I guess.
Thank you for the advice. I tried to bend it a little, but was too scared of breaking it, so ended up just sticking a piece of polyurethane tape to the body to dampen the vibrations, I will give it another try. It appears that the root cause of the issue is the horizontal portion of the tube that somehow got bent outward. https://photos.app.goo.gl/dY9AuFFvF4yst18U9

I have no idea why the horizontal portion is bent, the vehicle has not been in any major collision.
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Old 08-29-2020, 10:22 PM   #6
06YarisRS
 
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Quote:
Originally Posted by Konstantin88 View Post
Thank you for the advice. I tried to bend it a little, but was too scared of breaking it, so ended up just sticking a piece of polyurethane tape to the body to dampen the vibrations, I will give it another try. It appears that the root cause of the issue is the horizontal portion of the tube that somehow got bent outward. https://photos.app.goo.gl/dY9AuFFvF4yst18U9

I have no idea why the horizontal portion is bent, the vehicle has not been in any major collision.
I had a look at your pic, but can't tell where it's contacting. I used a combination of small wood blocks and a crowbar, wrapped in cloth to do my bending.
That horizontal tube can be moved back and forth in the little plastic retainers. Can you maybe indicated on a copy of your pic where the contact is? Nice clean engine bay, btw.

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Old 09-02-2020, 09:38 PM   #7
06YarisRS
 
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Konstantin88, please check out my Red Yaris restoration thread. I discovered how you can access the large inner cavity that is prone to rust.
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Old 09-03-2020, 11:42 PM   #8
komichal
 
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Just sharing my experience with rattling sounds with AC engaged and idling.... It was the exhaust heat shield that rusted off and with specific engine revs (hot engine, AC on, idling) it got rhytm and started shaking like mad. I took it away completely and driving a few years since then.
I know that this is not the case for your OP but someone may find this thread later when searching for answers.
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