[GT182]

Remember? They came out of the factory back then with 190 thermostats in them, so 190 is good. That temp helps clean the moisture out of your engine and the reason 190 T-stats were used.

I'd say that above 210 is where you start to worry. 220 might be ok for a very short time, but no higher. I think Pontiacs can handle the heat a little better than Chevies or the other makes, but not for very long. I got vey worried when mine was reaching temps from 220 to 245. That's when I recored the radiator to an SLK core and started looking onto the water pump and divider plate issues. Luckily it's now just the pump and plate issue causing overheating.

One other thing... only use the green antifreeze. Red when it gets hot or sits long enough [forgot which it was] will start to gel up and plug things up. Charles' son found that out the hard way. Maybe it's ok in newer vehicles but I won't use it in my GTO.... again. Yeah, I made the mistake but caught it fast enough and got rid of it.