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Corolla 9th Gen/1st Gen Matrix (2003-2008) 9th generation Corolla and 1st generation Matrix discussion.

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post #1 of 17 Old 06-10-2019, 09:18 PM Thread Starter
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Noise from AC compressor

Hi,

A few days ago i changed the belt tensioner in my 06 corolla because of squeaky belt sound. After the change now i hear a purr noise coming from ac compressor it only happens when the car is in drive and around 1000 rpms. It also happens when stop at red light and star moving, here's a video.

https://youtu.be/3JQYYcBPh0E

Any suggestions of what could be?
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post #2 of 17 Old 06-10-2019, 10:40 PM
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Over or under charged refrigerant maybe?
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post #3 of 17 Old 06-11-2019, 08:53 AM
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Do you still have the old tensioner? Put it back on and see if that "purr" noise goes away. Was the belt replaced also? Does that purr sound happen when the A/C is turned on or off or both? I still have my original tensioner even with 374K miles. Belt has only been changed once (Gatorback belt).

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post #4 of 17 Old 06-11-2019, 10:31 AM
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What it may be is the belt stretched and is loose around the compressor pulley.

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2012 Mazda 5

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post #5 of 17 Old 06-11-2019, 03:48 PM Thread Starter
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Yeah, i still have the old tensioner, the belt is pratically new changed it few months ago, is one of those dayco. I've notice it makes the noise when the ac is off also, but louder when ac is on. So maybe something is vibrating around the ac compressor, cause it only happens when around 800 to 1000 rmps.
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post #6 of 17 Old 06-11-2019, 04:15 PM
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Idle the engine and see if the belt has slack.

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9th Gen Corolla XRS
2012 Mazda 5

"If it ain't broke yet, it's probably still working like a Swiss time piece; until you open it up and all hell breaks loose"
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post #7 of 17 Old 06-11-2019, 04:36 PM Thread Starter
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I think next weekend gonna put back the old tensioner as you suggested and see what happens.
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post #8 of 17 Old 06-11-2019, 04:40 PM Thread Starter
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Don't see any slack
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post #9 of 17 Old 06-11-2019, 04:41 PM
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When you first replaced the belt, you did not have the noise until later when you replaced the tensioner, right?


If so, put your old tensioner back in and see if the noise goes away.


The reason I suggest reinstalling the original tensioner is because I think you're saying that the problem didn't happen until you replaced it, so I'm suggesting something might be wrong with the new tensioner since that is the only variable.


And yeah.....you can also check what 75aces suggested. EDIT: Oh, you already did that, OK.

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post #10 of 17 Old 06-11-2019, 07:48 PM
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Additionally as an example,

Many of you are aware that when belts are replaced (like timing belts), that it is recommended to replace all pullies and any devices operated by the belt (like a water pump) because all those pullies have become accustomed to the original belt with the tension that was applied with that belt over time/miles. Often, when a belt but nothing else is replaced, the other devices later go bad. It's because a different belt with its varying tension compared to the previous belts will put stress on those pullies. You might want to check all devices driven by the belt.

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post #11 of 17 Old 06-11-2019, 07:51 PM
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That sounds like a bad tensioner... especially the 800 to 1000 RPM and and when taking off. There's a bushing in the pivot of the hydraulic shock that makes that sound when it fails. Did you buy a cheap tensioner? Only buy Toyota, Denso, or Dayco tensioners.


Also these hydraulic tensioners must be SLOWLY compressed and decompressed... like 30seconds from relaxed to collapsed and back. If not they can be damaged.

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Last edited by K_Watson; 06-11-2019 at 08:02 PM.
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post #12 of 17 Old 06-11-2019, 09:12 PM Thread Starter
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I got one of those "GATES 39068 Belt Tensioner", I'll try to put the old tensioner next sunday and check the pulleys i'll let you know.

Thanks for your suggestions.
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post #13 of 17 Old 06-11-2019, 09:40 PM
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Quote:
Originally Posted by mrand0926 View Post
I got one of those "GATES 39068 Belt Tensioner", I'll try to put the old tensioner next sunday and check the pulleys i'll let you know.

Thanks for your suggestions.
A spring based replacement... interesting...

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post #14 of 17 Old 06-12-2019, 01:23 AM Thread Starter
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Found this in amazon,

https://photos.app.goo.gl/ZCZgfiL5ayGZKmrk8

i'm missing that alternator decoupler pulley, maybe that's the cause of the noise.
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post #15 of 17 Old 06-12-2019, 08:15 PM
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It's probably the tensioner. Personally, I don't like OAD pulleys as they have a service life of only 75K to 100K miles.

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