Thanks for all of the input. So I added some coolant as it was a little low and that has helped with the swishing noise but the car still won't produce heat that is warmer than 75 degrees. Things that I have also read that would indicate the heater core is going out would be: humidity in the passenger cabin, moisture in the floorboard. We have neither of those. I am checking hoses this weekend and hoping to find a clog. I will also look for the drain and try to bleed out any air.
As for the lights and indicators, I opened up the cover over the positive battery post and found that it was severely corroded, cleaned it an hoping that helped as well.
I will report back my findings as soon as I find them.
