I made a very very horrible mistake. I added a gallon of coolant with out mixing with water. Drove for a few weeks and car started over heating AC shut off... I was wondering if a Flush would fix this problem?

 

Ok.. why did you have to add the coolant?

 

I don't know why but I think I had a small leak somewhere.

 

I believe the reservoir had a small crack in it.

 

Ok.. is all that fixed? Is there anything else that could cause overheating besides too high antifreeze/water ratio? I mean, you could always just let 1/2 gallon or so out and add back the water. But if your low and needing to add more, you've other problems