Humming Headliner

jhortonvt · Sep 13, 2007

I just bought an '01 Denali, and if I turn the key to the 'On' position I get this Humming/Vibrating from the headliner just to the left of my head, in the area of the little speaker-which I believe is for the Onstar system.

I don't always hear it when the vehicle is running but I think it's just because of the ambient noise.

It sounds like a little fan running-poorly. If I press on the headliner or speaker it changes the pitch.

BTW I do NOT think its associated with the rear passenger climate controls, as I can adjust that fan speed with no affect on speed or pitch of the vibration.

JKmotorsports · Sep 13, 2007

There is a small fan behind the grille in the headliner that draws in the air from the interior to a temp sending unit. You may have to replace the fan/assembly with a new one.

jhortonvt · Sep 14, 2007

Sounds like your onto it JK, but where's the "grille" in the headliner?

JKmotorsports · Sep 17, 2007

jhortonvt said:
Sounds like your onto it JK, but where's the "grille" in the headliner?

That's the circular thing on the headliner to the left of the driver's head that looks like a speaker.

Whipple1 · Sep 18, 2007

jhortonvt said:
I just bought an '01 Denali, and if I turn the key to the 'On' position I get this Humming/Vibrating from the headliner just to the left of my head, in the area of the little speaker-which I believe is for the Onstar system.

I don't always hear it when the vehicle is running but I think it's just because of the ambient noise.

It sounds like a little fan running-poorly. If I press on the headliner or speaker it changes the pitch.

BTW I do NOT think its associated with the rear passenger climate controls, as I can adjust that fan speed with no affect on speed or pitch of the vibration.

I have that same sound that comes from mine,its not there all the time,I thought that was onstar also,I guess I will be changeing that fan too.

JKmotorsports · Sep 18, 2007

FYI: You have to remove the sensor from the backside of the headliner, not from the front. The part should only be about $7 or so.

1.Remove the left a-pillar trim (the trim along the inside of the windshield. It is held in place with clips).
2.Remove the left center pillar trim.
3.Remove the left center pillar assist handle.
4.Remove the left sunshade.
5.Remove the retaining screws from the headliner.
6.Gently pull down the headliner.
7.Disconnect the electrical connector from the inside air temperature sensor.
8.Remove the inside air temperature sensor from the headliner.

jhortonvt · Sep 19, 2007

Thanks JK.
I'll ask my local autoparts store for that and get it fixed...it's pretty annoying.

jhortonvt · Sep 20, 2007

Well I shopped around and the best price I could find was $27 from a parts store (GMC dealer wanted $46).

JK where did you get that price of $7?

jhortonvt · Sep 20, 2007

Good news, for now. I got access to the 'inside ambient air temperature sensor'-thank you JK for the instructions. :thumbsup:

When I disconnected the fan and it's housing from the grill housing it didn't hum anymore. So I blew all the dust off with compressed air, adjusted the little sensor so it wouldn't come in contact with the fan, then placed the housings back together. It seems to be fine. If it comes back I'll replace it, but I think I just saved myself 30 bucks.:clapping:

JKmotorsports · Sep 21, 2007

jhortonvt said:
Well I shopped around and the best price I could find was $27 from a parts store (GMC dealer wanted $46).

JK where did you get that price of $7?

I'm sorry. Typo. I meant $47 ($46.99).

JKmotorsports · Sep 21, 2007

jhortonvt said:
Good news, for now. I got access to the 'inside ambient air temperature sensor'-thank you JK for the instructions. :thumbsup:

When I disconnected the fan and it's housing from the grill housing it didn't hum anymore. So I blew all the dust off with compressed air, adjusted the little sensor so it wouldn't come in contact with the fan, then placed the housings back together. It seems to be fine. If it comes back I'll replace it, but I think I just saved myself 30 bucks.:clapping:

Cool. Nice job. I'm sure that little tip will help other people save money too!

Humming Headliner

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