Sloshing liquid behind steering wheel.
 

Whenever I drive my car in the morning, I hear quite a bit of liquid sloshing behind (and above) the steering wheel. I park slightly uphill, and it only happens once I start moving.

Does anyone know what causes this?

2011 370z touring

Your post isn't very clear...

You hear sloshing above the steering wheel? Like free-floating in the air above the steering wheel? :icon14:

You said it only happens once you start moving if parked on an uphill slope. Are you saying that you hear sloshing when you're not moving on level ground or a downhill slope?

The clutch and brake fluids are on the other side of the firewall from the steering wheel, and I guarantee you they slosh while driving. But you'll never 'hear' them sloshing.

Air bubble trapped in the heater core?

The sound is right in front of me when I'm in the driver's seat, and it sounds like it's just below the hood - so yeah, it kinda sounds like its floating above and behind the steering column. It sounDs like someone is pouring a glass of water - its loud. It only happens when the car has been sitting overnight - I haven't checked on a flat road or parking backwards.

There is a long spring in the steering wheel that may be making the noise.

Edit: If that's not it, I agree with Chuck33079 that it may be an air pocket in the HVAC system.

I'd think it's something like condensation buildup in the cowl area that drains out once you start moving. I'm not sure where the drain holes are (front or back side of that area) but try backing into you parking spot and see if it still happens.

Windshield washer fluid? Fill the reservoir and see if the sound goes away.

U left a 20 oz. under hood while working on it?:icon17:

The flopper in the toiler is hang up.

The reservoir is located on the right front, behind the bumper, below the headlight, in front of the tire.

I thought it might be condensation, but it happened today while driving. I was stopped at a light (after 45 mins on the freeway), while on mostly flat ground, as I started forward I heard it again - although quieter than in the morning.

Could there be a bottle of water or other something under/behind the seat?

I’ve heard of a loose nut behind the steering wheel; but sloshing liquid behind steering wheel is new to me! ;)

I'm aware of that, as well as where the other various reservoirs, etc are located. However, I think I've only ever heard 2 things "sloshing" in my vehicles while driving...gas and washer fluid. Air pocket/bubble in HVAC system? Has anyone actually heard sloshing from that? Start checking the simplest explanations first. I could also believe a water bottle in the car.

Yup. Many times. Loud and very noticeable. My father in law's car would routinely have this happen. Get the front of the car up in the air and burp the coolant system and it would go away for 10k miles or so.