dtc code po117 and coolant fans run constantly

Check/test the coolant temperature sensor and check the fan circuit all the way back to the computer

This code sets when the coolant temp is more than 280 for more than 3 second.

the ect was replaced the old one was checked for resistance and compared to the chart in manual and was way off .The dic keeps saying engine hot A/C off but the fans never shut off when running and the engine was never hotter than 180.My snap on old 2500 scan tool will read trouble codes but will not let me see any data on this car do u think we might have a ecm problem?

Check the wireing back to the ecm. I would like to see date on a scaner. Will the fan turn on as soon as you start the car ?

as soon as u start the car the fans [both] turn on and stay on. i have been checking all the wiring over and over and i don, t see any problems,i know that i am missing something.I did buy this car cheap because some one tried to replace the head gaskets and had the ds gasket on upside down blocking oil passage to cams so i do believe that he caused this problem

Have you checked the new temp sender to see if its in speck. Could the new one be reading wrong or be the wrong one .

i just did and it has no continuity [open]

Sound like you found it . Get a new one good luck .