Green antifreeze or coolant as some call it.

RustyRatRod said

The problem comes in when you mix different colors. Of course, it's not just the color, it's the chemical makeup and some can have bad reactions and turn to a thick goo like gel and it almost impossible to get it all out, if you mix the wrong colors together. MY advice to all my customers was to use the store brand universal. That way, "just in case" another color or type is mixed in later on down the road, either "by accident" OR "in case that's all you can find" in an emergency kinda situation, it does not matter, because the universal will mix with it ALL. Just my 2 cents and probably worth exactly that.

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I totally understand what you are saying. The reason this came up is that hopefully in not too long time I will try to connect the heater core and then need to add some fluid. Now, the car has been going in the Los Angeles are without air condition, and I was thinking maybe that was the reason it was disconnected. But it might be a leaking heater core too. And if the leak is very small, I might end up trying something like bars leak or whatever to seal it. Or get the heater core fixed. And then we'll, the system needs to be flushed and new coolant put it. However, a good flush could be a smart thing in any case. When it comes to mixing coolant types I have a "reputation" for just adding up water if I don't have the same brand that is on the car.

Bill