RedFish said

did it run hot before the sender failed ? I asked because this isn't making sense to me. maybe you got faulty sender. If you have a ohms meter... 80 ohms is no needle movement 32 to 34 ohms is 180 to 190 degrees and where most thermostats begin to operate 10 ohms is 250 degrees.

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67Dart273 said

Or beg or borrow an infra-red gun thermometer. In other words make SURE it's actually running hot

Is it puking coolant out the overflow?

An engine "properly" running to normal temp with a 190---195 stat on a warm --to -- hot day might SEEM hot

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