Odd defrost noise?

[Boogeyman]

Okay so I don't think I would really call this an issue since it doesn't seem to affect anything but when I have my defroster running on a low speed it sounds like it runs in a cyclic burst mode or something. Every few seconds it sounds like it is blowing harder or venting or something, kind of hard to explain. I just noticed this last night and I haven't investigated it much. Has anyone else noticed this on their car?

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[GiddyUp15]

It could be the A/C cycling. Most cars will automatically turn on the A/C with the defrost, and most have cyclic A/C...so maybe that's the reason?

 

[Boogeyman]

Eh... the cycle and sound doesnt quite match that. Like I said its an odd thing but if it happened in your car im sure you would notice. I still need to go play with it a bit and try to put my finger on what exactly it is.

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