vent noise at shut off

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11-10-2003, 06:38 AM

Mitaka

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vent noise at shut off

I have been hearing some kind of noise that comes on every time I turn the car off. It seems like some kind of electrical motor doing something for about 2-3 seconds after the ignition is turned off. It comes from the vents or that general area. Possibly flapper motor or the AC compressor shutting down? Anyone else heard that before?

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11-10-2003, 06:59 AM

ryoung

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There's a hissing noise ...

as the freon in the AC system equalizes pressure. This is normal - is it what you're hearing?

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11-10-2003, 07:11 AM

Mitaka

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Re: There's a hissing noise ...

I think so.

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11-11-2003, 05:49 AM

skiracer

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Run the AC in Econ mode for a minute before shutdown- does the noise go away?

If so, then what you are hearing is what ryoung stated- the compressed coolant in the AC system continuing to flash across the JT valve (orifice) until the pressure equalizes. This is normal.