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Chirp at warmup

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Old Nov 22, 2022 | 07:09 PM
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vinflouen
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2019 W222 S560 4Matic/2025 Yukon Denali
Chirp at warmup
Small chirp chirp at start up that goes away as it gets warmer. It's not as constant as a water pump......
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Old Nov 23, 2022 | 04:55 PM
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Anything from a loose belt, a worn belt, a bearing going out in {water pump, alternator, A/C compressor}, maybe a few more.
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Old Nov 23, 2022 | 08:40 PM
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2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
Usually a tensioner pulley. A bit soon for a 2019 to need that though. But any mechanical part can fail or have a quality control issue.
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Old Nov 23, 2022 | 09:07 PM
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2019 W222 S560 4Matic/2025 Yukon Denali
Originally Posted by seamus2154
Usually a tensioner pulley. A bit soon for a 2019 to need that though. But any mechanical part can fail or have a quality control issue.
The car had the VBelt tensioner replaced last year.... It's intermittent but I'm going to keep an ear out.
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Old Dec 3, 2022 | 12:22 AM
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Having this same chirp just at start up then it goes away
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Old Dec 3, 2022 | 12:29 AM
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S560, GLS63
Having this same chirp just at start up then it goes away
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Old Dec 3, 2022 | 07:44 AM
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Chirp is classically related to drive belt, pulleys or tensioner.
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