shaoxqw

Chirping noise from serpentine belt area. A Goodyear Gatorback type of belt was used to replace the old one, and the tensioner pully was also changed. But the noise is still there. Usually the chirping noise can be heard after I start it and drive about one mile, then in idle, the noise becomes a little bit quiet. Any suggestions or solutions would be very appreciated.

ukrkoz

Water pump. Typical symptom - loud on cold start and goes away as warms up.

shaoxqw

Thanks Ukrkoz, but my symptom is no noise at cold start, until warming up (about one mile driving) the chirping noise comes out.

RXGS

iTrader: (2)

Alternator decoupler pulley. Remove the black plastic cover on he alternator pulley, spray some lube, and if the squeaking stops, thats the culprit.

ukrkoz

Well:
Usually the chirping noise can be heard after I start it and drive about one mile, then in idle, the noise becomes a little bit quiet.
Give me credit on this. It can be understood as I did.
Do not spray "lube". Spray water out of spray bottle. Does just fine to spot squeaks of this nature. And does not make belt slippery. Alternator bearings are so typical noise makers... and they can make noise for several hundred thousand miles and not fail...

kennytbone

It could be any pulley. Don't start replacing things until you pinpoint which one is actually failing.

The method in this video works well for checking pulleys:

RXGS

iTrader: (2)

It could be any pulley, but based on his symptoms, it is likely this pulley. His symptoms mirror both the persons' whose thread I found, and mine as well. I even brought my car to the mechanic and they could't even get it to squeak because at the time, I did not realize that it did not squeak until a mile or so of driving.

I originally thought the squeak was from the belt as it was somewhat worn even though it was far from being past it. Replaced it with a Dayco belt and the noise remained. After reading that Dayco belts were prone to making noise, I put on a gatorback, which also made a noise, which is when I found the thread on the decoupler pulley, which ultimately was the issue.

Another way to tell is if you take the belt off the alternator pulley and spin it. If it spins forwards and backwards, then it is for sure the culprit. From what I have been told, the alternator bearings are separate from the decoupler pulley bearings, so just because the alternator is fine, it does not mean the decoupler pulley is fine.

https://www.clublexus.com/forums/rx-...r-warm-up.html

shaoxqw

I had placed an order for mechanics stethoscope, I believe it will work like what you posted. Thanks!

shaoxqw

It's interesting to see the similar cases. I will keep a close eye on ADP next time when I work on it again. Thanks RXGS.

ukrkoz

mechanic stethoscope... It's called piece of garden hose of suitable length. Works like a charm. I even used a wooden stick, one end covered by thumb and then placed against ear. I actually do have stethoscope. For years. And don't find it any more useful than those basic tools.