How to run Heater after A/C deleted

I would love to keep things minimal without a lot of extraneous clutter. But if I need the water valve assembly I’ll use it. I’ve already cleaned it up and polished it just in case. In the meantime I’ll try blocking the red and white lines and hook up the door blender hose to vacuum.

I really don’t need the heater for warmth. Mostly want it if I need to defrost the windows for whatever reason. Or if the wifey is cold.