Chrysler 400

Hellrats said
After rereading your OP, I think your good to go. It's hot in Texas and if you have a overheat problem I'm sure it would show up real fast. If it's not boiling over when you shut it off I don't see a problem. If the temp comes right back down after a hot soak when you restart it your cooling system is working for sure.

So yesterday for the first time ever it over filled to radiator overflow after I killed it. Soon as I started it, it cooled back to about 200 in the garage with the AC running. The rad capn is 13 lb.

Not sure why it spiked like that. It was 102 outside.