What is this?

[h22dx]

What is behind this panel? When I start my car it sounds like a motor priming for about 5 seconds behind it??

 

[Tonyrodz]

What you hear should be the fuel pump priming.

 

[h22dx]

What you hear should be the fuel pump priming.

Is that where the fuel pump is? Though it was in the tank?

 

[Tonyrodz]

It is in the tank. Are you sure it's coming from that panel?

 

[h22dx]

It is in the tank. Are you sure it's coming from that panel?

Pretty sure. What is behind the panel? I don't think it's for the rear hvac??

 

[HiHoeSilver]

I actually do think there is rear heat actuators in there... Not positive though.

 

[06 Yukon XL]

Depending on year rear A/C maybe I there. It was okay my 2006 xl

 

[h22dx]

I actually do think there is rear heat actuators in there... Not positive though.

I have a 99 OBS, it doesn't have rear heat

 

[HiHoeSilver]

I have a 99 OBS, it doesn't have rear heat

Rear air?

 

[h22dx]

Rear air?

That's a possibility but it comes on everytime you start it, even with all the hvac off.

 

[HiHoeSilver]

That's a possibility but it comes on everytime you start it, even with all the hvac off.

Yeah, I think those actuators calibrate and find their spot. Its a little servo motor, if it's going bad it will keep searching. Does your rear ac work?

 

[h22dx]

Yeah, I think those actuators calibrate and find their spot. Its a little servo motor, if it's going bad it will keep searching. Does your rear ac work?

The rear works great when it works, a lot colder than the front. However I have a leak somewhere and a charge only last about 2 weeks

 

[HiHoeSilver]

The rear works great when it works, a lot colder than the front. However I have a leak somewhere and a charge only last about 2 weeks

Does the noise happen when you turn the key to on without starting? Maybe you are just hearing the fuel pump.

 

[h22dx]

Does the noise happen when you turn the key to on without starting? Maybe you are just hearing the fuel pump.

Good point, yes it does

 

[HiHoeSilver]

Good point, yes it does

The fuel pump is in the tank, but is audible for sure. I guess something hvac related may come on with just acc power, too, but I forgot no rear heat on OBS, so why would there be an actuator back there? I'm betting @Tonyrodz is right.

 

[Tonyrodz]

The fuel pump is in the tank, but is audible for sure. I guess something hvac related may come on with just acc power, too, but I forgot no rear heat on OBS, so why would there be an actuator back there? I'm betting @Tonyrodz is right.

Is the obs fuel tank in that area? I know the nbs fuel tank is on the driver side between front seats and 2nd rows, or there abouts.

 

[HiHoeSilver]

Is the obs fuel tank in that area? I know the nbs fuel tank is on the driver side between front seats and 2nd rows, or there abouts.

OBS is also driver side rear.

 

[fishmagnet]

Rear AC blower motor in there, fuel pump on the other side underneath and inside fuel tank.

 

[Big Mama]

Do you have auto ride? Could be your compressor turning on to level the ride.

 

[h22dx]

Do you have auto ride? Could be your compressor turning on to level the ride.

I wish I did but unfortunately no