Your car shouldn't be overheating even with the Stock Radiator, we have plenty of Zs in AZ that are running stock radiators and keeping cool even w/ the A/C on. The Koyo will hold more coolant at a lower temperature, thus as it flows through the system, it will run cooler. So if you have something in the system not functioning properly, then we have to look at a different solution. The Koyo is still a good investment in AZ, so you can't go wrong with it. We still have to pinpoint exactly where your problem is. Why don’t you bring it in, so we can look further into? You don’t have to get upset at me because a proven product didn’t work for your car, if it was defective I would replace it. You know where to find me.
