Ahah, stop leak, I knew I'd get grief for that choice, however, a new rad at that point was good money after a lot of bad....
I'm using a pre mixed coolant and I will check with my manual on specs. I add it to the overflow tank. I live in Canada, it's cold here.... Can't use just water. I'm not sure where it is "going" as it didn't appear to be leaking for some time and my tip off that it was low was when the heater wouldn't warm up. The original leak was a slow drip but there was always evidence that it was dripping on the driveway....
I never drove it during this time as it was unreliable, the over heating issue is new.
What I found confusing was that after the first time I topped it up, it over flowed, which I understand maybe I put too much in, however, I don't understand why it would overflow again a week later? Would that be because it was a warmer day and I drove it longer?
I'm not sure about driving it anywhere as it is now. If I add more coolant, up to the cold line, is that wise? Could yesterday's engine light issue be due to too little coolant? Im worried that there is a complete blockage somewhere from that crap. If the engine sucks the coolant in, is that a sign it isn't blocked?