Sounds like a leak.
You have a cooling system leak, you need to have the system pressurised to find the location of the leak.
too much anti freeze has nothing to do with heater. but you should always keep the antifreeze level under the MAX indicator on the reservoir because you need the space for the heated antifreeze to expand and to siphoned back when it's cooled down.
The engine coolant reservoir ( which has a 50 / 50 mix of antifreeze and distilled water from the factory ) is located in the engine compartment on the passenger side
Yes, as long as you are certain that it is the coolant reservoir.
In the reservoir.
To put in more antifreeze in a 1995 Plymouth Voyager, located the reservoir near the radiator. Antifreeze is no longer added directly to the radiator. It is put into the plastic reservoir that is labeled radiator or coolant overflow.
If you overfill the reservoir and radiator with antifreeze, it will generally expand as it gets hot and spill out of the reservoir. When it does that, it will usually spill onto the hot engine and create "smoke".
In the coolant reservoir when the engine is cool.
Once your vehicle is warmed up, if you have antifreeze coming out of the overflow you have too much in your radiator.
Yes , usually a 50 / 50 mix of antifreeze and preferably distilled water is used
in the radiator reservoir
The only place available is the coolant reservoir.