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Preemptive Post - A/c Makes A Humming Noise


Grumpy Cabbie
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We've had a few hot days lately and having a black car I've had to have the a/c working quite hard a few times. The car started that loud electrical humming noise when the a/c compressor was running and I thought I'd do a preemptive post for the newbie hybrid owners.

The a/c on the hybrid is electrical and not driven by a belt from the engine. This is an efficient system but it HUMS loudly under initial full load on a hot day. This is normal and nothing to worry about - though alarming the first time you hear it.

Apparantly the a/c system draws 4kw from the HV Battery under full load.

The hotter the day, the harder the a/c works and the louder it can be - but it will die down and is unlikely to be heard in the car.

:thumbsup:

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We've had a few hot days lately and having a black car I've had to have the a/c working quite hard a few times. The car started that loud electrical humming noise when the a/c compressor was running and I thought I'd do a preemptive post for the newbie hybrid owners.

The a/c on the hybrid is electrical and not driven by a belt from the engine. This is an efficient system but it HUMS loudly under initial full load on a hot day. This is normal and nothing to worry about - though alarming the first time you hear it.

Apparantly the a/c system draws 4kw from the HV battery under full load.

The hotter the day, the harder the a/c works and the louder it can be - but it will die down and is unlikely to be heard in the car.

:thumbsup:

Can't hear mine hum, probably because of the road noise round Rotherham :rolleyes:

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  • 2 weeks later...

Just bumping the thread as we've had some hot days and somebody is bound to ask :yes:

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Since I just got my Prius, but living in Thailand I was also surprised that the ac made such much noise. If it takes 4kW of power, then that might be the reason that I never had full Battery? Max I got on a 200 km drive was 7 lines.

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Mine doesn't hum because it knows the words to the tune :yahoo:

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