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I have a 2021 Palisade Limited and for the past year when I am using the AC there is a noticeable hissing sound on start-up. The sound also comes and goes every few minutes while it's in use. The noise is present regardless of temperature and air speed. I didn't think it was a cause for concern because the AC and heat work without any issues. Dealership didn't have any answers. Has anyone else noticed this with their vehicle?
 

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You might be hearing the refrigerant gas spraying from the expansion valve into the evaporator core in the heater box. It varies as the compressor cycles which would be the coming and going.
 

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You might be hearing the refrigerant gas spraying from the expansion valve into the evaporator core in the heater box. It varies as the compressor cycles which would be the coming and going.
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Said “Thanks, my car looks great!” Once more; thank you for two great jobs with a
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