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Vibration while sitting idle with AC turned on

Steveg203

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Steve
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2026 4 Runner limited
My 26 stumbles as well if you idle with the air conditioning on, not sure if this is a problem or if this is the way it is
Mine does an intermittent stumble while idling. I thought that was strange and I was ready to address this when I bring it in.
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bakutheleo

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Yeah, very high-pitch whine is probably the turbo (at least it does sound like that). I usually only hear it briefly as it spins up on acceleration, but I also have a high-pitch hearing loss so maybe it is blowing everyone else's ear drums ;-).

@Gumpus I think you are spot on, although one thing...4lo torque is after the transmission, so I would not expect that to affect a/c.

I checked with Google Gemini, and it does verify my suspicion that the a/c compressor uses an electric motor for the hybrid version, but a traditional mechanical pump for the gas models. So, that would explain differences as well as the sounds. Definitely one of the less-known advantages of the hybrid versions--I suspect there are quite a few that may not be obvious.
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