Usually this is a typical sign of air in the cooling system, if you have had fluid levels changed recently, its very possible the system was not bled of air when refilling. The gurgling is caused by air moving through the heater core. This is a common problem with the 4.6 liter engine used in the Town Car, Crown Vic, and Mercury Marquis.
Sometimes a VERY slight hiss is audible after using the ac. But a gurgling is not normal and usually a sign that there is air in the cooling system. The noise is the air "gurgling" through the heater core. I'd almost bet money that's the problem.
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