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Belt Noise

971 Views 7 Replies 4 Participants Last post by  Terrasmak
Hi - My 2011 Sienna 3.5L FWD is starting to make a chirping noise from the belt area. It's probably from one of the pulleys; problem is identifying which one. Any tips on how to find the issue, or anyone have the same issue?

Here's a link to the audio of the noise. Sienna-Noise.mp3
Thanks for the help.
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Just ordered a Gates belt to replace the existing belt. Figured it was worth the $25 since I have to re-install it anyway after checking the pulleys. Biggest concern is having to replace the tensioner as it seems fairly complicated and the part itself is pricey.

Thanks for the detailed instructions. Extremely helpful, especially regarding the pulleys. I'll let you know what I find.
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I replaced the belt, idler pulley, and tensioner pulley yesterday. The chirp is gone!

Here's what I found after taking off the belt.
1. The water pump pulley spun with some resistance and I wasn't able to wiggle it; seemed ok.​
2. The idler was rough.​
3. The tensioner pulley wiggled a bit.​
4. The belt was dry and had cracks.​
Regarding the tensioner pulley, I found some videos that referenced Gates 36174 as a very close replacement. I gave it a shot ($40 on Amazon) and found that it fit just fine, even with the new dust shield and the existing tensioner bolt.

Biggest issue with the entire job is the amount of space you have to uninstall and reinstall the pulleys.

For reference, here are the parts I used for my '11 Sienna LTD 2WD (3.5L 2GR-FE)
1. Belt: Gates K070610 Micro-V Serpentine ($27)​
2. Idler Pulley: Gates 36173 ($35)​
3. Tensioner Pulley: Gates 36174 ($40)​
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Question> How many miles does your sienna have now?
My car has almost 100K and I am thinking to replace the belt.

Thank you for sharing the part numbers!
It's at ~185k miles.
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