The sound you describ sounds like air trapped in your cooling system. This is usally caused by a slow leak somewhere in the system, water pump, hose, cap etc. You need to "burp" your system to get the air out in the short term, in the long term you need to find & fix the leak.
Remove the radiator cap (when cold) & start the engine. Get an empty 2L coke bottle, 3/4 fill it with water. Place it upside down in the filler neck any any air in the system will bubble up into the bottle