You need to check for codes with a scan tool. Some codes don't show up on the dash light, like a fan code. Further, the TPS controls the fan. It could be that too.
Check and make sure your rad and condenser fins are clear. It's a very common problem.
Make sure your belt tensioner is in working order.
I assume you've checked the fluid level. Keep an eye on it to see if it goes down or if there is excessive pressure in the rad
Bad Rad cap will cause strange issues too.
180 state will do nothing for you on these
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