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Mechanical hum -- behind stereo head unit?

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minnesota Enthusiast

minnesota

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Posted

??? wondering if anyone else notices some kind of light mechanical hum --- seems to come from behind the stereo head unit sporadically --- sometimes even after truck turned off. I've also had it kick in when listening at very low volume, truck off, key on Accesory. Any ideas what the #### it is? I could do without. This is in a C3, but I'd think the head unit is same as many other models have.

Shaners Senior Enthusiast

Shaners

Posted
Posted

I think there is a cooling fan back there for the head unit.  I think it is thermostatically controlled...

minnesota Enthusiast

minnesota

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Posted

Shaners - thanks -- was thinking that as well -- must be new feature for 99+ models. 97 Sub had essentially same unit but I never heard a fan...

woyster_00z71 Enthusiast

woyster_00z71

Posted
Posted

It is a cooling fan located on the back of the stereo unit.  My friend has a '96 chevy truck that we investigated the sound on.  Upon pulling the head unit we saw the fan mounted on the back.  When the stereo gets hot, it turns on regardless if the truck is on or off or what...kind of annoying.

 

But anyway, that is what it is.  Don't know what year they started putting them on but at least '96 for sure.

 

Just my 2 cents.

 

B.J.

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