humming sound from cargo area on startup

[Danzigman]

Recently went I start the Tahoe in the morning I hear a humming sound coming from the cargo area. It only lasts for abou 20 - 30 seconds. I can't figure out what it could be. I am thinking maybe the rear washer pump? It is a z71 so I do not have the autoride suspension. Any ideas?

 

[Rangel]

I have a similar sound,(kinda buzzy) up front somewhere on start up.

 

[OR VietVet]

Could it be from outside under there, fuel pump, and echoing in the cargo area?

 

[YukonXL04]

Could possibly be your hvac actuators

 

[Mr. 960]

Could possibly be your hvac actuators

This, if you have the auto climate control. Could it be your fuel pump heading south???

Mr. 960

 

[02yukxl]

Could be the small vent above your head that looks like a little speaker cover. Has a fan in there for the climate control.

 

[Red Rider]

Sit in the back and have someone start it so you can get better location of humming. I would have said actuators too.