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UPDATE :
Ok, so I tried what you said. I sprayed a good amount of belt dressing on the belt. Nothing has changed. Still can hear the noise sometimes between shifting (especially from 1nd-2nd/2nd-3nd). Rarely, I will hear the noise from 3nd-4nd (and if I hear it, it will be really quiet and quick like 0,5 seconds).
Nothing left but to adjust or replace the belt. We could, perhaps, work out a perfect argument and that still would not change what the machine does. Decide what you want to do now. Tha ball is in your court. Good luck.

By design, the 2010 Corolla transmission is a rough shifter. That's how mine has been from zero miles to a tick over 100,000 miles. All maintenance was done on time by the dealer.
 

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Discussion Starter · #22 ·
Nothing left but to adjust or replace the belt. We could, perhaps, work out a perfect argument and that still would not change what the machine does. Decide what you want to do now. Tha ball is in your court. Good luck.

By design, the 2010 Corolla transmission is a rough shifter. That's how mine has been from zero miles to a tick over 100,000 miles. All maintenance was done on time by the dealer.
I will follow your advice then. I will try to adjust it first.

I have two questions :
Is it hard to change the belt?
How can I make sure that I don't over tight-it?


Btw, thx for letting me know about the transmission. I was really concerned about it. I guess the car is just designed like that.
 

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I have a Corolla 2010 automatic (178 000 km). Recently, a new problem just started. When my car is running for the first 15 minutes, I hear a belt noise from 1nd to 2nd and 2nd to 3nd. If I accelerate harder, the belt noise will be shorter (probably because I don't let the time to my car for shifting smoothly). But the noise occurs between the changing delay of the gears. After about 30 minutes, I will barely hear the noise, or the noise just disappear.

Is it something wrong with my transmission?
Belt noise is never an indication of transmission problems.
 

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I had a bad trans one time that squealed when shifting. I was just suggesting the possibility that the noise is not the belt at all, especially because the op mentions some trans issues.
 

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I had a bad trans one time that squealed when shifting. I was just suggesting the possibility that the noise is not the belt at all, especially because the op mentions some trans issues.
Revving the engine in the driveway ( short, hard blips ) should make the belt squek if the belpt is loose. If the transmission is getting noisy, that should be looked at by a transmission specialist.
 

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Discussion Starter · #26 ·
UPDATE :
Sorry for the delay. So I tried to make a video with the noise between gear from the best that I could. In the video, my car shift from 1-2 and 2-3, you hear a noise from the gears

Here is the video
 

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Check this video out. The owner had lost power steering when driving through rain. PHAD was able to recreate the issue and lost power steering with ac and defroster on. Could be similar to what you're hearing.

 
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