Water/gurgling sound F150

[Kmiles84]

Looking for some help. I have a 2013 f150 with 5.0. I have been hearin a water/ gurgling sound coming from behind the dash. After doing some searching it was suggested that the coolant level is low and there is air in lines. Check and had a leak and low coolant. Got it fixed and topped off and still hear the noise. Heater is working and truck is t over heating. It is now suggested that I bleed/burp the lines to remove air. Has anyone encountered this before? Dealer already wanted $360 to fix leak that ended up being a $6 o-ring inside the radiator hose.

[Radar]

My wife’s car had that problem and the drain hole by the condenser was plugged up and the box had water sloshing in it

[Pineywoods]

I've just noticed this same noise on my new '17 F150.

[Kmiles84]

I will check the drain next after dinner, that’s a good idea

[flywise]

When my vehicle did that it was a partially clogged heater core.
Might take lines off and flush it with a water hose