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27/05/2026 11:05 am
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2012 Toyota Sienna with 161,000 mi. Alternator and AC replaced within the past 2 years. Original water pump, radiator and pulleys. Rattling sound starts after the engine is warmed up and gets louder intermittently. Engine is not overheating.
I posted a video to my YouTube channel and below is a link so you can hear what I'm hearing.
https://youtube.com/shorts/9jJCatD7D2E?si=ujm9f9nyoXdLynak
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27/05/2026 6:38 pm
I would make a guess that that is your timing belt tensioner ... I have a Honda Odyssey and it was recently replaced and it sounded very similar to your sound. I would use a Aisin Brand only OEM replacement.
This post was modified 3 weeks ago by thdesha
