Gurgling Sound, Gurgling Sound coming from under my hood. Options

[5150EVH]

I recently noticed that when I come to a stop, I hear a gurgling sound coming from behind my firewall. I only hear this sound hear and there. I noticed too that when I turn my heat on the sound goes away....however, I smell a whiff of antifreeze when I first turn on the heat. I have been in the automotive business for 4 years (manager at Autozone and with CarQuest) and know that usually when there is overheating or this type of symptom and you turn your heater on and the problem goes away...its usually the thermostat. I was just wondering if anyone else has had this problem or if anyone could please give me some advice. I would greatly appreciate it. Thank you.

[alltracman78]

I recently noticed that when I come to a stop, I hear a gurgling sound coming from behind my firewall. I only hear this sound hear and there. I noticed too that when I turn my heat on the sound goes away....however, I smell a whiff of antifreeze when I first turn on the heat. I have been in the automotive business for 4 years (manager at Autozone and with CarQuest) and know that usually when there is overheating or this type of symptom and you turn your heater on and the problem goes away...its usually the thermostat. I was just wondering if anyone else has had this problem or if anyone could please give me some advice. I would greatly appreciate it. Thank you.

Does the sound come from under your dash?
If so most likely you have air in your coolant system.
Normally that means a leak, especially if you're smelling coolant when you turn the heat on.

How is the carpet up under the dash?
Wet at all?

You might have a very minor leak right now that's mostly blocked by corrosion.
How well do you maintain your cooling system?
Have you had it regularly flushed?
Do you use good coolant and distilled water [no tap/well water]?

If you get it flushed now you might break open the leak [if that's what it is].

If your brave you can tear your dash out and take a look at the heater core. Lots of work though.