2003 Sierra - air pumps above driver when cold outside?

Okay, I noticed that when it's cold outside, less that about 45°F, there is a pump or something that runs in the headliner just above the driver's seat. There is a small vented cap right where I hear the noise. What is this pump thing for? Can I disable it or is it important?

TIA

-kw

Reply to
Ken Williams
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I think that has something to do with Automatic Climate Control. Do you have that?

"Ken Williams" wrote in message news:WPmwf.7351$JT.6190@fed1read06...

Reply to
JBDragon

Yes it does have the Automatic CLimate COntrol option.

Reply to
Ken Williams

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