Gurgling when engine is turned off - 2005 Dodge Grand Caravan

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that indicates that the engine is on the point of overheating
when the engine is turned off the water is no longer circulating around the cylinder walls and head and the heat from those items makes it boil off hence the gurgle

Well the spark knock could be bad gas or the ignition timing could be off.
The gurgling is somewhat normal, unless the level of coolant is low in the engine, and there is too many air pockets.
If a head gasket were leaking, you would be loosing coolant out the exhaust pipe.

Need more detail. Are you seeing coolant on the ground after the vehicle has been sitting all night? Do you hear a gurgling after you shut the engine off? Does the overheating occur when the vehicle is moving or only when it is sitting still?

More info needed. Is the temp gauge reading high, coolant leaking, cooling fan working?

In many cases of gurgling cooling system, you have a possible head gasket problem starting and the combustion from the engine is pressurizing the cooling system. Check your cooling system thoroughly for evidence of a possible blown head gasket.
Are you loosing cooling system water?
Is your radiator overflow tank being pressurized excessively by the engine. Headgasket problems can sometimes put some much pressure in that overflow tank that it begins to bulge outward.
Check the oil and look for any white/greyish milk shake consistency fluid on the oil fill cap or on the radiator cap. Keep a close eye on your oil and water levels if your gurgling sound continues. This is not normal and again, usually is a sign that there is a possible leak between the headgasket and a water jacket on the head.
Did you overheat the vehicle anytime soon? This will many times breech a head gasket between water jackets and begin spraying water in small amounts right into the engine cylinders, while it pressurizes the cooling system and makes gurgling noises.

Is the thermostat opening at 195 degrees ? Does the radiator fan come on at 220 degrees ?
The gurgling noise is usually air or coolant moving around in the system. If the engine is very hot this noise can be normal.

It may be a early signs of the intake manifold gasket. Did you check your radiator and water pump. Also if there is any antifreeze around your engine, then it's a intake manifold gasket. As for the hazard light thing and turn signal, something has to be replaced there.

You might need to have your cooling system bled, to get all the air out of it. That gurgling is probably just air being pushed in to the overflow tank. Not to much to worry about though.

Is the coolant system completely full? It may have air in the system and what you are hearing is the air trying to pass the water pump.
You could also be hearing the valves and air flow through throttle body.