It sounds like you need a new Radiator cap for the overflow style Radiator. The overflow style has a recovery vent which draws the water back through the radiator neck and into the engine. Low heat levels are also a sign of a water shortage.
Your antifreeze strength needs to be 50/50. This sounds like there is an ice block inside the Radiator or engine. Get the strength of the antifreeze tested.
You could have an internal leak; you need to have the system pressure tested. The overflow tank should drain back into the radiator and it relies on a sealed system to work. If you have a leak, there will be no Vacuum pressure to draw the antifreeze back into the engine.
It could be a head gasket leak, or a leaking heater core, or bad radiator or a bad hose. The pressure test can be done by anyone with a gauge. You could try Autozone or Oreillys for their loaner tools. Ask for a Radiator tester pump. You can also have the cap checked.
Radiator and A/C shops do this test routinely. A real Service station used to do this routinely until they went self-serve.
I hope my solutions give you a few alternatives because a head gasket is a costly repair. I hope you find my solutions very helpful.
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