Over heating corvette

I have a 92 corvette that the cooling fan don’t come on untill the temp gets to about 260 degrees. it started after i changed the water pump then i changed the thermostat and fan relays but no help. it the winter it’s fine as a matter of fact i think it comes on too much in the winter. what did i do wrong ? cross some wires or what. i have one fan jumped out now to run all the time.

This is a duplicate thread, I recommend responding to the other thread with the same name that already has responses.