heat problem was first concern, thought thermostat was most likely concern, changed that, still no heat.
2nd assummed heater core was next likely, and ended up flushing it, still likely not completely clean, but now have heat -- as long as we have water.
5 mile test out worked no overheating and had plenty of heat, but after a 30 min lunch, 2 miles back we started overheating, this is the first time this happened in this cars history, and at this time, no heat.
tried a couple times burping out the air and it drives fine for short distances and has heat until it overheats, then we stopped to check how high the water was and it took quite a bit this time. when restarted the car, instantly water was gushing from the resevoir overflow tube and when the engine cooled back down, it was very low on water again