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Your heater core is going bad, or there is air in the system. Happened to me had to replace heater core. I did it myself and it was a little bit of a pain. Took four hours.
A sort of a rush, a whistle, a swissle i suppose ;)
making or characterized by a hollow bubbling sound."a faint gurgling noise"(of a baby) making a contented sound."a gurgling baby who will one day inherit the throne"
A "gurgling" sound on the right side of the navel is due to digestion and is completely normal.
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It is not smoke. It is steam. Moisture is making the gurgling sound and moisture coming in contact with a warmer surface (the coil) is evaporating making steam.
A bad valve can cause this sort of sound.
A burble is a bubbling, gurgling sound, or a rapid gush of speech.
The presence of fluid and/or mucus, giving characteristic signs when listened with a stethoscope e.g. rales.
A cooling system is supposed to be drained not just to rid the gurgling sound. It also helps the plumbers to clean and unclog any accumulated residue.
The gurgling sound is caused by pressure in the engine coolant system(antifreeze) slowly releasing into the coolant overflow resevoir. Typically a faulty thermostat causes this sound.
Murmur