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Hello, Eddie here and I will do my best to help. this gurgling sound is likely coolant cycling through the heater core. The coolant level is probably low, what I would advise, is park the vehicle with the back end facing down, and the front end of the engine on an incline. take off the radiator cap, and fill it full, also fill up the overflow jug to the full mark. crank the engine and let it idle until it warms up. after it warms up, get inside the car and rev it to 1800-2000 rpm's for a few minutes, then turn the engine off, and let it sit till it cools, remove the radiator cap and top off the coolant again. That should purge any air out and get rid of that gurgling sound. Let me know if you have any further questions. Thank you.
Any luck with that? or have you tried it yet? Thank you!