Coincidence. The rust was blocking the leak. Mine hasn't leaked in 150,000 miles and several flushes.My leak in my heater core at 27,000 miles started when I put thermocure in to flush the system.
You apparently used it for a reason. That makes it your fault.If the rust was blocking the leak it was not a coincidence! It happened because of the thermocure.
Quick question, if both hoses are hot and I am getting NO hot or warm air in the cabin would this indicate another problem?I flush it from both directions several times with the hose to break stuff up. I also put my thumb over the end and release creating a "hydraulic hammer" effect to best l break even more up.
If you are worried about the small'ish amount of water in the heater core not being distilled, you could try and flush it again with distilled. Of course you'll need to bleed the system again when you are done.
Sounds more like a blend air door issue. If both heater hoses are hot, it means hot coolant is flowing through the core. If it was luke warm air coming out of the vents, it could be because of a partially plugged core or really scaley/nasty inside of the core not letting the heat transfer. Not even warm? I'm guessing blend air door.Quick question, if both hoses are hot and I am getting NO hot or warm air in the cabin would this indicate another problem?
Tough to get pressurized distilled water. Flushing it with the hose then using a funnel to run distilled through it should get must of that hose water out.Do not use tap water or water from the hose to flush your heater core. The minerals in the water will rust your system.
Get distilled water from the store and flush it with several gallons of distilled water.