Figured I’d post how I fixed this so others can benefit. Bought a high mileage 07 about two months ago. The entire time it made a gurgling noise from behind the dash caused by an air bubble in the heater core. Burped the cooling system multiple times, flushed the cooling system, and the noise always came back after a few minutes.

A few days ago I noticed the rubber hose that is supposed to draw coolant from the overflow tank fell off and was resting inside the tank. As a result it was sucking air into the radiator. Blew out all the gobbly-gook that was stuck inside the hose and reconnected with a hose clamp. That was on Monday and the noise has yet to return. Hopefully this helps someone!

 

The gurgling sound of the water has been the same for me since I replaced the radiator fan. The pipe that sucks water in seems fine and isn't falling out - what else should I try?

 

Clearly you have air in the cooling system. I use one of those funnel bleeders Works great!

 

Thank you, you made my day.